Physics Chapter 13 - Magnetic Effects of Current

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Questions and Answers

What is the primary function of the earth wire in electrical appliances?

To provide a high resistance path for current

To increase the voltage of the current

To keep the potential of the appliance equal to that of earth (correct)

To conduct current away from the appliance

What is the typical current capacity of a circuit designed for high power appliances in a domestic setting?

10A

15A (correct)

20A

What occurs during a short circuit due to damaged insulation?

Zero or negligible resistance to current flow (correct)

The current is halted

Resistance is increased

Current is redirected to the earth wire

Which of the following best describes overloading in an electric circuit?

Exceeding the wire's capacity with excessive current Signup and view all the answers

How can a fuse prevent overloading in an electrical circuit?

By breaking the circuit when current exceeds a certain level Signup and view all the answers

Which type of circuit arrangement is used to provide equal potential difference to each appliance?

Parallel connection Signup and view all the answers

What happens to live wire during the heating effect according to Joule’s law?

It produces heat and sparks Signup and view all the answers

What is the consequence of connecting too many appliances to a single socket?

Overloading occurs due to excessive current Signup and view all the answers

What happens to the galvanometer when both the bar magnet and coil are stationary?

It shows no deflection. Signup and view all the answers

What is the effect on the galvanometer when the south pole of the magnet is used?

It indicates a deflection in the opposite direction. Signup and view all the answers

What induces a potential difference in the secondary coil?

A change in current in the primary coil. Signup and view all the answers

According to Fleming's Right Hand Rule, which finger represents the direction of the induced current?

Middle finger. Signup and view all the answers

What happens to the galvanometer when current in coil-1 is turned off?

It shows a deflection in the opposite direction. Signup and view all the answers

What is the highest induced current condition according to electromagnetic induction principles?

When the direction of motion is at right angles to the magnetic field. Signup and view all the answers

Which of the following describes electromagnetic induction?

Induction of current due to changing magnetic fields. Signup and view all the answers

In the mutual induction experiment, what is the role of the primary coil?

To induce current in the secondary coil. Signup and view all the answers

What did Hans Christian Oersted demonstrate about electricity and magnetism?

They are linked to each other. Signup and view all the answers

What happens to a compass needle placed near a current-carrying conductor according to Oersted's experiment?

It deflects in the opposite direction if the current direction is reversed. Signup and view all the answers

What happens to the strength of the magnetic field as the distance between field lines increases?

The strength of the magnetic field decreases. Signup and view all the answers

What is true about the magnetic field lines from a bar magnet?

They form closed curves. Signup and view all the answers

What indicates the strength of a magnetic field?

The closeness of the magnetic field lines. Signup and view all the answers

What rule can be used to determine the direction of the magnetic field around a current-carrying conductor?

Right Hand Thumb Rule Signup and view all the answers

Why is it impossible for two magnetic field lines to intersect in a magnetic field?

Intersecting lines would imply two directions of magnetic field at the same point. Signup and view all the answers

What does the north end of a compass needle align with?

The north pole of the magnet. Signup and view all the answers

Which statement accurately describes a magnetic field?

It has both direction and magnitude. Signup and view all the answers

What observation occurs when the direction of current in a circuit is reversed?

The compass needle's deflection reverses direction. Signup and view all the answers

What occurs if the flow of current through a conductor is stopped?

The compass needle comes to rest. Signup and view all the answers

According to the Right Hand Thumb Rule, if you point your thumb in the direction of the current, what do your fingers represent?

The direction of the magnetic field lines Signup and view all the answers

In Oersted's experiment, what material was used as the conductor?

Copper wire. Signup and view all the answers

What is the relationship between electricity and magnetism when a current flows through a conductor?

Electricity creates a magnetic field around the conductor. Signup and view all the answers

Which statement is true regarding the lines of magnetic fields?

They indicate the strength by their density; closer lines mean stronger fields. Signup and view all the answers

What describes the direction of the magnetic field around a straight conductor carrying current?

It forms concentric circles around the conductor. Signup and view all the answers

What direction does the middle finger indicate when using the right-hand rule?

The direction of induced current Signup and view all the answers

Which statement correctly contrasts Alternate Current (AC) and Direct Current (DC)?

AC changes direction periodically while DC is unidirectional. Signup and view all the answers

What is the frequency of AC in India?

50Hz Signup and view all the answers

What is the role of the earth wire in domestic electric circuits?

It is connected to a copper plate deep in the earth for safety. Signup and view all the answers

What is the potential difference between the live wire and neutral wire in a home circuit?

220V Signup and view all the answers

Which ACCURATE statement applies to the advantages of AC over DC?

AC can be transmitted over longer distances with less energy loss. Signup and view all the answers

What is the color coding for the live wire in a domestic electric circuit?

Red Signup and view all the answers

Which of the following accurately describes the nature of Direct Current (DC)?

It does not change direction with time. Signup and view all the answers

What rule is used to determine the direction of the magnetic field created by a current-carrying wire?

Right Hand Thumb Rule Signup and view all the answers

Which of the following statements is true about the magnetic field inside a solenoid?

The magnetic field is uniform and represented by parallel straight lines. Signup and view all the answers

What happens when a soft iron rod is placed inside an energized solenoid?

It becomes an electromagnet due to magnetization. Signup and view all the answers

According to Andre Marie Ampere's suggestion, what happens when a current-carrying conductor is placed in a magnetic field?

It experiences an equal and opposite force. Signup and view all the answers

What effect does the configuration of a solenoid have on its behavior as a magnetic device?

It behaves like a bar magnet with distinct poles. Signup and view all the answers

When a current-carrying conductor is placed between the poles of a magnetic field, what direction does it move?

In a perpendicular direction to its length. Signup and view all the answers

Which characteristic describes a solenoid when energized?

It produces a strong uniform magnetic field throughout its interior. Signup and view all the answers

How does the magnetic field due to a current-carrying wire appear at the center of a loop?

As a straight line. Signup and view all the answers

Study Notes

Chapter 13 - Magnetic Effects of Electric Current

Oersted's experiment demonstrated the relationship between electricity and magnetism.
Oersted observed that a compass needle placed near a current-carrying wire exhibited deflection.
Reversing the current direction reversed the needle's deflection.
This signifies a connection between electricity and magnetism, creating a magnetic field around the conductor.
A magnetic field encircles a current-carrying conductor.
The strength of the field depends on the proximity to the conductor; closer lines indicate a stronger field.
Magnetic field lines are closed curves extending from the north pole to the south pole outside the magnet and from south to north pole inside.
Magnetic field lines never intersect.
The right-hand thumb rule helps determine the direction of a magnetic field generated by a current-carrying conductor: point the thumb in the current direction; the curled fingers indicate the field direction.
A solenoid (a coil of wire) exhibits a uniform magnetic field within its core, with one end acting as a north pole and the other as a south pole.
An electromagnet is created by placing magnetic material within a solenoid, amplifying the magnetic field.
A current-carrying conductor in a magnetic field experiences a force perpendicular to both the current and the magnetic field directions.
This is described by Fleming's left-hand rule.
Current and magnetic field influence the direction and magnitude of the force on the conductor.
Electromagnetic induction is the process of inducing an electromotive force (EMF) or voltage in a conductor by changing the magnetic field around it.
Moving a magnet near a coil of wire generates a current in the coil.
Changing the current in a coil induces a current in a nearby coil (mutual induction).
Self-induction is the phenomenon where changing current in a coil induces a voltage in the same coil.

AC vs DC

Alternative Current (AC) has varying direction, while Direct Current (DC) flows consistently in one direction.
AC transmission is more efficient over long distances.

Domestic Circuits

Domestic circuits use 220V (in India) potential difference at 50Hz frequency.
Three wires are crucial: live (high potential), neutral (0V potential), and earth (safety ground).
Earth wire protects against electric shocks.
Fuses and circuit breakers prevent overloading and short circuits.
Overloading occurs when the current drawn by appliances exceeds the cable's capacity.
A short circuit happens when live and neutral wires come in direct contact.

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Description

Explore the fascinating relationship between electricity and magnetism in this quiz based on Chapter 13. From Oersted's experiment to the right-hand thumb rule, test your understanding of magnetic fields created by current-carrying conductors. Discover how distance affects field strength and the unique properties of magnetic field lines.