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Questions and Answers
What happens to the magnitude of the magnetic field produced at a given point if the current through the wire increases?
What happens to the magnitude of the magnetic field produced at a given point if the current through the wire increases?
- It becomes zero
- It increases (correct)
- It decreases
- It remains the same
The direction of magnetic field lines is reversed if the direction of current through the straight copper wire is reversed.
The direction of magnetic field lines is reversed if the direction of current through the straight copper wire is reversed.
True (A)
What happens to the deflection of the compass needle if the compass is moved away from the copper wire but the current through the wire remains the same?
What happens to the deflection of the compass needle if the compass is moved away from the copper wire but the current through the wire remains the same?
The deflection in the needle decreases.
The concentric circles representing the magnetic field around a current-carrying straight wire become larger and larger as we move away from the _______________________.
The concentric circles representing the magnetic field around a current-carrying straight wire become larger and larger as we move away from the _______________________.
What is the effect of increasing the current in the wire on the deflection of the compass needle?
What is the effect of increasing the current in the wire on the deflection of the compass needle?
The magnetic field produced by a given current in the conductor remains the same as the distance from it increases.
The magnetic field produced by a given current in the conductor remains the same as the distance from it increases.
Match the following statements with the correct outcome:
Match the following statements with the correct outcome:
What is the effect of reversing the direction of current through the straight copper wire on the direction of magnetic field lines?
What is the effect of reversing the direction of current through the straight copper wire on the direction of magnetic field lines?
What happens to the direction of force acting on the current-carrying rod when the poles of the magnet are interchanged?
What happens to the direction of force acting on the current-carrying rod when the poles of the magnet are interchanged?
The direction of force on the conductor depends only on the direction of current.
The direction of force on the conductor depends only on the direction of current.
What is Fleming's left-hand rule?
What is Fleming's left-hand rule?
The displacement of the rod is largest when the direction of current is at right angles to the direction of the _______________________ field.
The displacement of the rod is largest when the direction of current is at right angles to the direction of the _______________________ field.
An electron enters a magnetic field at right angles to it. What is the direction of force acting on the electron?
An electron enters a magnetic field at right angles to it. What is the direction of force acting on the electron?
Match the following devices with their uses:
Match the following devices with their uses:
The magnitude of force on the conductor is highest when the direction of current is parallel to the direction of the magnetic field.
The magnitude of force on the conductor is highest when the direction of current is parallel to the direction of the magnetic field.
What is the condition for the maximum displacement of the rod?
What is the condition for the maximum displacement of the rod?
Which of the following correctly describes the magnetic field near a long straight wire?
Which of the following correctly describes the magnetic field near a long straight wire?
What happens to the current in the circuit at the time of short circuit?
What happens to the current in the circuit at the time of short circuit?
The earth wire is used as a safety measure to ensure that any leakage of current to a metallic body does not give any severe shock to a user.
The earth wire is used as a safety measure to ensure that any leakage of current to a metallic body does not give any severe shock to a user.
What is the primary function of a fuse in an electric circuit?
What is the primary function of a fuse in an electric circuit?
The magnetic field of a solenoid carrying a current is similar to that of a _______________________.
The magnetic field of a solenoid carrying a current is similar to that of a _______________________.
Match the following electric power supply components with their descriptions:
Match the following electric power supply components with their descriptions:
What is the frequency of the AC electric power received in houses?
What is the frequency of the AC electric power received in houses?
The potential difference between the live wire and the neutral wire is 110 V.
The potential difference between the live wire and the neutral wire is 110 V.
What is the purpose of a fuse in an electric circuit?
What is the purpose of a fuse in an electric circuit?
A compass needle is a small magnet with two poles, one pointing towards east and the other towards west.
A compass needle is a small magnet with two poles, one pointing towards east and the other towards west.
What is the right-hand rule used for?
What is the right-hand rule used for?
Field lines are used to represent a magnetic field, and they are shown closer together where the magnetic field is _______________________.
Field lines are used to represent a magnetic field, and they are shown closer together where the magnetic field is _______________________.
What is the expected result when an electric oven of 2 kW power rating is operated in a domestic electric circuit (220 V) that has a current rating of 5 A?
What is the expected result when an electric oven of 2 kW power rating is operated in a domestic electric circuit (220 V) that has a current rating of 5 A?
Match the following statements with the correct description of a magnetic field:
Match the following statements with the correct description of a magnetic field:
What precaution should be taken to avoid the overloading of domestic electric circuits?
What precaution should be taken to avoid the overloading of domestic electric circuits?
What is the right-hand thumb rule used for?
What is the right-hand thumb rule used for?
The direction of the magnetic field at a point is given by the direction that a south pole placed at that point would take.
The direction of the magnetic field at a point is given by the direction that a south pole placed at that point would take.
Two magnetic field lines can intersect each other.
Two magnetic field lines can intersect each other.
What is the direction of magnetic field at a point directly below a horizontal power line carrying current from east to west?
What is the direction of magnetic field at a point directly below a horizontal power line carrying current from east to west?
The right-hand thumb rule is used to determine the direction of magnetic field lines around a current-carrying _______________.
The right-hand thumb rule is used to determine the direction of magnetic field lines around a current-carrying _______________.
What is the pattern of the magnetic field lines produced around a current-carrying straight wire?
What is the pattern of the magnetic field lines produced around a current-carrying straight wire?
Match the following terms with their definitions:
Match the following terms with their definitions:
The magnetic field lines around a bar magnet are circular.
The magnetic field lines around a bar magnet are circular.
What is the direction of magnetic field at a point directly above a horizontal power line carrying current from east to west?
What is the direction of magnetic field at a point directly above a horizontal power line carrying current from east to west?
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Study Notes
Magnetic Field Around a Current-Carrying Straight Wire
- The direction of magnetic field lines around a straight wire can be determined by the right-hand thumb rule.
- If the thumb points in the direction of the current, the fingers will wrap around the conductor in the direction of the field lines.
- The magnetic field lines form concentric circles around the wire, with the direction of the field lines being clockwise or anti-clockwise depending on the direction of the current.
- The magnitude of the magnetic field produced at a given point increases as the current through the wire increases.
- The magnetic field produced by a given current in the conductor decreases as the distance from it increases.
Fleming's Left-Hand Rule
- Fleming's left-hand rule is used to determine the direction of the force on a current-carrying conductor placed in a magnetic field.
- The rule states that if the first finger points in the direction of the magnetic field and the second finger in the direction of the current, the thumb will point in the direction of the force.
- The force on the conductor is perpendicular to both the direction of the current and the magnetic field.
Electric Motor and Generator
- Devices that use current-carrying conductors and magnetic fields include electric motors, electric generators, loudspeakers, microphones, and measuring instruments.
- The electric motor uses the principle of electromagnetic induction to convert electrical energy into mechanical energy.
- The electric generator uses the principle of electromagnetic induction to convert mechanical energy into electrical energy.
Safety Measures in Electric Circuits
- Two safety measures commonly used in electric circuits and appliances are fuses and circuit breakers.
- Fuses are used to protect the circuit from short-circuiting or overloading, while circuit breakers are used to protect the circuit from overloading.
- Overloading can occur due to an accidental hike in the supply voltage or connecting too many appliances to a single socket.
Magnetic Field Lines
- Magnetic field lines are used to represent a magnetic field.
- A field line is the path along which a hypothetical free north pole would tend to move.
- The direction of the magnetic field at a point is given by the direction that a north pole placed at that point would take.
- Field lines are shown closer together where the magnetic field is greater.
Electromagnets
- An electromagnet consists of a core of soft iron wrapped around with a coil of insulated copper wire.
- When an electric current flows through the coil, a magnetic field is produced.
AC Electric Power
- In our houses, we receive AC electric power of 220 V with a frequency of 50 Hz.
- The potential difference between the live wire and the neutral wire is 220 V.
- The earth wire is connected to a metallic body deep inside the earth and is used as a safety measure to ensure that any leakage of current to a metallic body does not give any severe shock to a user.
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