Electromagnetic Induction Quiz 2 – Punjab Meritorious School Preparation Portal

Welcome to your 27th Sep Electromagnetic Induction Quiz 2 CBT TEST

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A metallic ring is held horizontal and a magnet is allowed to fall vertically through it with N-pole pointing upwards. The acceleration of magnet near the ring is a. Then-

a = g

a g while receding

a < g while approaching as well as receding

a > g while approaching but a < g while receding

Two identical coaxial circular loops carry a current i each circulating in the same direction. If the loops approach each other-

the current in each loop will decrease

the current in each loop will increase

the current in each loop will remain the same

the current in one loop will increase and in the other loop will decrease

Consider the situation shown in figure. If the switch is closed and after sometime it is opened again, the closed loop will show-

an anticlockwise current-pulse

a clockwise current-pulse

an anticlockwise current-pulse and then a clockwise current-pulse

a clockwise current-pulse and then an anticlockwise current-pulse

A square coil ACDE with its plane vertical is released from rest in a horizontal uniform magnetic field B of length 2L. The acceleration of the coil is-

less than g for all the time till the loop crosses the magnetic field completely

less than g when it enters the field and greater than g when it comes out of the field

g all the time

less than g when it enters and comes out of the field but equal to g when it is within the field

Consider the situation shown in figure. The wire AB is slid on the fixed rails with constant velocity v. If the wire AB is replaced by a semicircular wire, the magnitude of the induced current will-

increase

remain the same

decrease

increase or decrease depending on whether the semicircle bulges towards the resistance or away from it

Two circular coils A and B are facing each other as shown in figure. The current 'i' through A can be altered-

there will be repulsion between A and B if i is increased

there will be attraction between A and B if i is increased

there will be neither attraction nor repulsion when i is changed

attraction or repulsion between A and B depends on the direction of current, it does not depend whether the current is increased or decreased

Consider the following statements-

(a) An emf can be induced by moving a conductor in a magnetic field.

(b) An emf can be induced by changing the magnetic field.

Both a and b are true

a is true but b is false

b is true but a is false

Both a and b are false

Some magnetic flux is changed from a coil of resistance 10 ohm. As a result an induced current is developed in it, which varies with time as shown in figure. The magnitude of change in flux through the coil in Webers is-

A conducting rod AB of length = 1 m is moving at a velocity v = 4 m/s making an angle 30º with its length. A uniform magnetic field B = 2T exists in a direction perpendicular to the plane of motion. Then-

Consider the situation shown in figure . If the current  in the long straight wire xy is increased at a steady rate the induced current in loop A and B will be -

clockwise in A and anticlockwise in B

anticlockwise in A and clockwise in B

clockwise in both A and B

anticlockwise in both A and B

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