Physics Past Paper - Chapter 4 Moving Charge and Magnetism - PDF

Machine Translated by Google Chapter-4 Moving Charge and Magnetism Choose the correct option- 1. A moving charge produces – (a) Only electric field (b) Only magnetic field (c) Both electric and...

Machine Translated by Google Chapter-4 Moving Charge and Magnetism Choose the correct option- 1. A moving charge produces – (a) Only electric field (b) Only magnetic field (c) Both electric and magnetic fields (d) None 2. The magnetic field produced at the center of a current flowing helical coil is - (a) at the end of the coil (b) perpendicular to the length of the coil (c) at 450 from the end of the coil (d) at 600 from the coil 3. The force applied on a moving charge in a uniform magnetic field is - 1 q , (a) qv Bÿ 4 r2 (b) 0 1 q , (a) 4 0 r (d) Zero 4. When a high resistance is connected in series with the coil of the galvanometer, it is formed - (a) Voltmeter (b) Ammeter (c) Voltmeter (d) none of these 5. If a charged particle enters parallel to the paramagnetic field then what will be the path of the particle - (a) Straight line (b) (c) Parabola (d) Financial None of these Fill in the blanks – 1. The torque applied on a current carrying loop hanging in a uniform magnetic field is maximum when the weight of the loop Magnetic field has the following properties: 2. The resistance of an ideal ammeter is.......... 3. The resistance of an ideal voltmeter is.......... 4. Shant is always added in........order. 5. The force applied on a moving charge in a magnetic field is called.............................. 6. The SI unit of magnetism is----------------. 7. The SI unit of magnetic intensity is----------------. 8. Magnetic field is a ----------- quantity. 9. If a charged particle moves with some velocity in the direction of the field in a uniform magnetic field, then the magnetic force applied on it is------------. 10. Tesla is the unit of -----------. 11. In the electric circuit, the ammeter is connected in----------. 12. By using shunt the ------- of galvanometer reduces. Machine Translated by Google 13. In a moving coil galvanometer, the poles are made -------- to produce a circular magnetic field. 14. The force between two parallel conductors carrying current in the same direction is of --------- nature. 15. In a magnetic circuit, the voltmeter is connected at ---------. 16. When two parallel conductors have opposite directions of current, they --------- each other. Answer in one sentence - 1. Write the SI unit of intensity of magnetic field. 2. A charge is moving in a uniform magnetic field but its direction remains the same. When is this possible? 3. When will the motion of a charge be circular in a uniform magnetic field? 4. When will the motion of a charge be circular in a uniform magnetic field? 5. If current is flowing in the same direction in two parallel conductors, what will be the nature of the force applied between them? 6. Write the value of magnetic field at the centre of the current carrying coil. 7. If 10 percent of the main current is to flow through a galvanometer having a coil of 99 ÿ resistance, then what will be the resistance of the shaft will be? 8. Why is a core of soft iron placed in the middle of the coil of a galvanometer? 11. If a charged particle enters parallel to a paramagnetic field, what will be the path of the particle? 12. When will the force applied on a moving charge in a uniform magnetic field be maximum? 13. What will be the direction of the magnetic force lines generated around a long current carrying conductor? Very short term/short term questions - 1. Write Ampere's circuital law. 2. Define the unit of magnetic field (B) on the basis of Lorentz force. 3. Write Ampere’s circuital law and derive it from Bio-Savart law. 4. Find the magnetic field on the axis of a current carrying circular coil. 5. Find the magnetic field at the centre of a current carrying circular coil. 6. Find the expression for the force applied on a current carrying conductor placed in a uniform magnetic field. 7. Write the difference between electromagnetic force and dielectric force applied on a charged particle. 8. Describe the effect of motion of charge in different directions in a uniform magnetic field. What is the angular momentum of the circular motion of charge? Write the formula for velocity. 9. Formula for the pitch (rattle interval) of helical motion of a charge moving in a uniform magnetic field in a direction different from the field. Establish it. 10. Write Ampere's circuital law and prove it. 11. Write Bio- Savartin's law. 12. On the basis of Bio-Savartin's law, define the unit of electric current. 13. Derive the expression for the force between two parallel current carrying conductors. When will it be attractive force and when will it be force Repulsive force? 14. What is called a solenoid? Formula for the magnetic field produced due to a long current carrying solenoid. 15. Formula for the torque on a current loop placed in a uniform magnetic field. 16. Formula for the magnetic rotation of a circular current loop. 17. Draw the nomenclature diagram of a moving coil galvanometer and write its principle. Why are its poles made permanent? Machine Translated by Google 18. What do you understand by sensitivity of galvanometer. Write expression for it and how can its sensitivity be increased? 19. What is called shunt? What is its use? 20. How can the sensitivity of moving coil galvanometer be increased? 21. How is moving coil galvanometer converted into ammeter and voltmeter? 22. Define the sensitivity of voltmeter. 23. Define the sensitivity of ammeter. Quantitative questions NCERT based 01. A long straight wire carries a constant current of 35A. What is the magnetic field at a point 20cm away from the wire? What is atom? 02. A long straight wire placed in a horizontal plane carries a varying current of 50A from north to south. Find the magnitude and direction of the magnetic field at a point 2.5m to the east of the wire. 03. Draw the ordinate of a horizontal electric wire carrying a varying current of 90A from east to west. What is the magnitude and direction of the magnetic field produced due to the varying current 1.5m below the wire? 04. A wire carrying a varying current of 8A is placed in a uniform magnetic field of 0.15T at an angle of 30o with the magnet. What is the magnitude and direction of the force applied on its unit length? 05. A circular coil of 100 turns has 100 turns, each of radius 8.0cm. And a constant current of 0.40A is flowing through it. What is the magnitude of the magnetic field at the centre of the coil? ------00------- Chapter 5 – Magnetism and Matter Fill in the blank spaces- 1. In SI system the unit of pole strength is---------------. 2. The direction of magnetic moment is along the magnetic axis towards---------------------. 3. In axial position the direction of resultant magnetic field is along the magnetic axis towards --------------------. 4. In linear position the direction of resultant magnetic field is along the magnetic axis towards--------------------. 5. In axial position the intensity of magnetic axis at that distance from the centre of the magnet as compared to linear position is---------- it is happening 6. Paramagnetic substances are -----------------towards a strong magnet. 7. Diamagnetic substances are----------from a strong magnet. 8. The magnetic tendency of a paramagnetic substance is -----------. 9. The magnetic tendency of a diamagnetic substance is -------------. 10. On drawing field lines by keeping the north pole of a bar magnet towards geographic north, the neutral point is in......position. is received 11. By keeping the north pole of a bar magnet towards the geographical south and drawing field lines, the neutral point is in...... position Is obtained. Write the answer in one sentence or one word. 01. Write the definition and unit of magnetic dipole moment. 02. Write the dimensional formula of magnetic field strength. Machine Translated by Google 03. Write any two properties of magnetic field lines. 04. There is a coil in a tube? If the direction of current at its ends is anticlockwise, which pole will be formed there? 05. A magnetic dipole is in temporary equilibrium in a uniform magnetic field when? 06. A magnetic dipole is in stable equilibrium in a uniform magnetic field when 07. What is the strength of the magnetic field at a point equidistant from both the poles of a bar magnet? very short answer questions 01. Write the inverse square law of coulomb in magnetism and define unit pole with its help. 02. What are magnetic field lines? Explain their properties. 03. Write Gass's law related to magnet. 04. Find the expression for the moment of the couple of forces acting on a magnetic dipole in a uniform magnetic field. 05. When a magnet is slightly deflected and released in a uniform magnetic field, it starts oscillatory motion. Its radius The formula for time is as follows. 06. Find the expression for the work done to rotate a bar magnet in a uniform magnetic field? 07. Find the formula for the potential energy of a bar magnet in a uniform magnetic field. Under what condition is the potential energy In which situation it is maximum and in which situation it is minimum? 08. What is the relation between the magnetization force of a substance and its mass M ? Write its formula, unit and dimensional formula. 09. Define the magnetic susceptibility of a substance. 10. Write the properties of paramagnetic, diamagnetic and ferromagnetic substances. Write two examples of these substances. Short answer questions 1. What will happen if a magnet is divided into two parts? (1) Transverse to its length (2) Longitudinal to its length 2. Why does anti-particle magnetism have a moment on the lower side? 3. What will happen if the iron bar magnet is melted? Will its magnetism remain intact? 4. A magnetic needle experiences torque in a uniform magnetic field but not the total force. However, a magnetic field placed near the needle experiences torque. Why does the iron nail experience the attractive force and torque of the entire magnetic field? ----00---- Chapter – 6- Electromagnetic Transmission ÿÿÿÿÿÿÿ ÿÿÿÿÿ -u Choose the correct option- 1. In electromagnetic induction, the induced electromotive force is the following - (a) transformation into flux (a) Time (a) Number of ferro (d) resistance of the coil 2. Lange's law is related to - (a) By the law of conservation of charge (b) By the law of energy conservation (c) From the law of conservation of mass (d) By the law of conservation of momentum 3. The direction of the induced current is determined by - (a) From Lange's law (b) By Fleshing's right hand rule (a) (a) and (b) both 4. (d) By Fleshing's left hand rule If there are N turns in the combined coil, then its inductance is directly proportional to - (a) N2 (b) N Machine Translated by Google (a) (d) N3 6. Electric magnetic induction was discovered by (a) Ampere (c) (b) Fair play Fleshmining 7. orethod(d) Thaw is the unit of inductance (a) (b) Fairday Hennier (d) Tethla (c) Beaver 8. Hennier is the unit of (a) Capacitance (b) Magnetic field (c) magnetic flux (d) inductance 9. A coil of area A is placed perpendicular to a magnetic field B. The coil is rotated through an angle of 180°. Magnetic flux The magnitude of change in will be (a) B.A. (a) 0 (c) 2B (d) 4BA Fill in the blanks – 1. Induced electromotive force is produced due to transformation in.......................... 2. By placing an iron core inside a coil its inductance becomes........ 3.The rate of change of magnetic flux is directly proportional to................ 4. The number of lines of force passing perpendicular to a surface situated in a magnetic field is called…………… 5. When the magnetic flux bounded by a circuit is changed, a…………….is induced in that circuit 6. The induced electromotive force changes the magnetic flux. 7. Lange's law is the law of conservation of ………. 8. With the help of Fleming's right hand rule, the …………. of induced current is determined 9. In SI system the unit of thermoinduction is……….. 10 On increasing the number of turns in a circular coil, its inductance is known to........ 11. Magnetic flux is a ………… quantity 12 The reason for sparks coming out when an electrical circuit is suddenly disconnected is………….. Answer in one sentence- 1. Write the SI unit of inductance. 2. Write the SI unit of magnetic flux. 3. The number of turns in a coil is doubled while keeping the total length of the coil unchanged. Its inductance How many times will it become? 4. What is called inertia of electricity? 5. The inductances of two inductor coils are L1 and L2. What will be the value of inductance if they are connected in series? 6. When an electric circuit is broken, what will be the direction of the induced current generated? 7. What is the fundamental cause of induction current 8. When does induced current arise in a closed circuit? 9. When is the value of magnetic flux minimum? 10. What is the unit of magnetic flux 11. What is the unit of inductance Machine Translated by Google 12. What is the dimensional formula of inductance. 13. Who discovered electromagnetic induction. 14. When is the value of magnetic flux maximum ? Very short answer questions 1. What is electromagnetic induction? 2. Write Faraday's law related to electromagnetic induction. 3. Write Lange's law related to electromagnetic induction and explain that Lange's law is in accordance with the law of conservation of energy. 4. Write any four differences between kinetic induction and other induction. 5. Draw a labeled diagram of an alternating current system. 6. What is cold induction? 7. Explain what is mutual induction. 8. On which factors does the mutual induction of a circular coil depend? 9. Name two factors on which cold inductance of an air core coil depends. 10. Write Fleshing’s right hand rule. 11. What is dynamic electromotive force? 12. Why is inductive electromotive force called opposing electromotive force? 13. Define a Hennier unit. Short answer questions 1. What is cold inductance? Derive the expression for cold inductance of a long tube. 2. The mutual inductance of two conductors P and S are L1 and L2 respectively. If there is ideal flux coupling between them then prove that Mutual inductance between the coils M = will be. 3. A tube of length 2 m and diameter 4 cm has 2000 turns. In the middle of it is a secondary pipe with 1000 turns. The catastrophe has taken place. Find out the mutual inductance between the two conductors. 4. For the inductance T of a parallel circular coil, establish the expression T. On what factors does its value depend and in what way? 5. What is called dynamic electromotive force? Give an expression for it. 6. Derive an expression for inductance between two connected circular coils. 7. What is a dynamo? Describe the principle and structure of alternating current dynamo with a diagram. ----00----