# XII_Physics_Electromagnetic Induction_4 Online Test

A rectangular coil of 20 turns and area of cross- section 25 sq cm has a resistance of 100 ohm. If a magnetic field which is perpendicular to the plane of the coil changes at the rate of 1000 Tesla per second, the current in the coil is ____.
1.0 ampere
50 ampere
0.5 ampere
5.0 ampere
The north pole of a magnet is brought near a metallic ring. The direction of the induced current in the ring is ____.
Clockwise
Anticlockwise
Towards north
Towards south
If a coil of metal wire is kept stationary in a non-uniform magnetic field, then ____.
An e.m.f. is induced in the coil
A current is induced in the coil
Neither e.m.f. nor current is induced
Both e.m.f. and current is induced
A coil has an area of 0.05 m2 and it has 800 turns. It is placed perpendicularly in a magnetic field of strength  it is rotated through  in 0.1 sec. The average e.m.f. induced in the coil is ____.
0.056 V
0.046 V
0.026 V
0.016 V
A moving conductor coil in a magnetic field produces an induced e.m.f. This is in accordance with ____.
Amperes law
Coulomb law
Lenz’s law
In the diagram shown if a bar magnet is moved along the common axis of two single turn coils A and B in the direction of arrow ____. 
Current is induced only in A & not in B
Induced currents in A & B are in the same direction
Current is induced only in B and not in A
Induced currents in A & B are in opposite directions
A magnet is dropped down an infinitely long vertical copper tube ____.
The magnet moves with continuously increasing velocity and ultimately acquires a constant terminal velocity
The magnet moves with continuously decreasing velocity and ultimately comes to rest
The magnet moves with continuously increasing velocity but constant acceleration
The magnet moves with continuously increasing velocity and acceleration
When a bar magnet falls through a long hollow metal cylinder fixed with its axis vertical, the final acceleration of the magnet is ____.
Equal to zero
Less than g
Equal to g
Equal to g in to beginning and then more than g
The magnetic flux linked with a circuit of resistance 100 ohm increases from 10 to 60 Weber’s. The amount of induced charge that flows in the circuit is (in coulomb) ____.
0.5
5
50
100
The total charge induced in a conducting loop when it is moved in magnetic field depends on ____.
The rate of change of magnetic flux
Initial magnetic flux only
The total change in magnetic flux
Final magnetic flux only
Description:

This test consist of 10 questions.Students should ideally take 10 minutes to complete the test. This test is useful for those students who are preparing for IIT JEE, AIEEE or any other engineering entrance test. This test consist of questions from Electromagnetic Induction and which, in general, is focused in AIEEE and IIT JEE. In this chapter,magnetic flux faraday's law lenz's law eddy current inductance ac generatorare key topic and mostly application based questions are asked.

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