Faraday's Experiments

Q.

Explain the faraday experiment in detail.

Q. Two identical coaxial circular loops carry current i each circulating in the clockwise direction. If the loops are approaching each other, then:

1. The net current in each loop increases.
2. The net current in each loop remains the same.
3. The net current in each loop decreases.
4. The net current in one loop increases but it decreases in the other.

Q.

What does negative EMF mean?

Q.

Two different loops are concentric & lie in the same plane. The current in outer loop is clockwise & increasing with time. The induced current in the inner loop then, is..........

1. clockwise

2. zero

3. counter-clockwise

4. direction depends on the ratio of loop radii

Q.

Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.

Q.

What is Faradays law and Lenz law?

Q.

A transformer works on the principle of

1. Lenz’s law

2. Ampere law

3. Self induction

4. Mutual induction

Q.

When a current carrying coil is moved away from a stationary coil, the direction of induced current in the stationary coil is

1. Same as that in the moving coil

2. Opposite to that in the moving coil

3. Practically zero

4. Nothing can be decided.

Q.

A magnet is brought towards a coil rapidly in the first case and gently in the second case. The induced e.m.f. will be:

1. Lesser in first case.
2. Greater in first case.
3. Equal in both cases.
4. Insufficient data given.

Q.

What is magnetic induction?

Q.

What is magnetic induction?

Q.

Who discovered diamagnetism?

Q.

A coil of insulated copper wire is connected to a galvanometer. If a bar magnet is held stationary inside the coil then there will be no deflection in the galvanometer.

1. True

2. False

Q. Faraday's law of electromagnetic induction is the principle behind the working of ________________.

1. security sensors
2. All of the above.
3. ATM cards
4. tape recorders

Q. ________ states current is induced in a conductor if the magnetic flux linked with the conductor changes.

1. Newton's law

2. Faraday's law

3. Pascal's law
4. Ampere's law

Q. What was Faraday's groundbreaking discovery?

1. Electricity can be used to produce magnets.
2. Magnets can be used to produce electricity.
3. Opposite magnetic poles attract just like opposite electric charges attract.
4. Electricity can be used to produce chemicals.

Q.

An electric current is induced in a circuit when:

1. a magnet is brought close to a wire.

2. a magnet is kept close to a wire.

3. a magnet is taken away from a wire.

4. a magnet is kept far from a wire.

Q.

In the given figure, the galvanometer will not have a deflection if:​

1. the bar magnet is moved in the direction shown

2. the bar magnet is moved in the opposite direction

3. the bar magnet is kept stationary

4. the wire loop on the conducting cylinder is moved towards the bar magnet

Q.

Name the scientist who introduced the principle of electromagnetic induction.

1. Galileo Galilei

2. Ampere

3. Michael Faraday

4. Hans Christian Oersted

Q.

Change in the number of magnetic field around a coil induces:

1. Current in coil

2. EMF in the coil

3. Both A and C

4. Frequency in coil

Q.

If a bar magnet is held stationary inside a coil, then the induced current in the coil is_______.

1. 1 ampere

2. 0 ampere

3. 2 ampere

4. 0.02 ampere