Electromagnetic induction

The magnitude of induced current is directly proportional to the rate of _____________ linked with the coil

• magnetic field

• number of magnetic field lines

• change of magnetic field

• change of number of magnetic field lines

What is electromagnetic induction?

Two coils C₁ and C₂ are wrapped around a non conducting cylinder. Coil C₁ is connected to a battery and key and C₂ with galvanometer G. On pressing the key , current starts flowing in the coil C₁. You will observe ________ in the galvanometer when key K is pressed on.

Two coils C₁ and C₂ are wrapped around a non conducting cylinder. Coil C₁ is connected to a battery and key and C₂ with galvanometer G. On pressing the key , current starts flowing in the coil C₁. You will observe ________ in the galvanometer when current in the coil C₁ is switched off

Two coils C₁ and C₂ are wrapped around a non conducting cylinder. Coil C₁ is connected to a battery and key and C₂ with galvanometer G. On pressing the key , current starts flowing in the coil C₁. You will observe ________ in the galvanometer when the current is passed continuously through coil C_1.

An induced emf is produced when a magnet is moved into a coil. The magnitude of induced emf does not depend on:

• The speed with which the magnet is moved

• The number of turns of the coil

• The resistivity of the wire of the coil

• The strength of the magnet

A coil of insulated copper wire is connected to a galvanometer forming a loop and a magnet is:

A: Held stationary

B: Moved away along its axis

C: Moved towards along its axis

There will be a induced current in:

• A only

• A and B only

• B and C only

• A, B and C

The condition for the phenomena of electromagnetic induction is that there must be a relative motion between

• the galvanometer and magnet

• the coil of wire and galvanometer

• the coil of wire and magnet

• the magnet and galvanometer

A magnet is moved towards a coil (i) quickly (ii) slowly. The induced potential difference

• more in (i) than in (ii) case

• more in (ii) than in (i) case

• same in both

• can’t say

The direction of induced current is given by

• Fleming’s right hand rule

• Fleming’s left hand rule

• Right hand thumb rule.

• Left hand thumb rule.