Faraday's laws are consequence of conservation of ____.
Energy
Energy and magnetic field
Charge
Magnetic field
A magnetic field of 2 ( 10– 2 T acts at right angles to a coil of area 100 cm2 with 50 turns. The average emf induced in the coil is 0.1 V, when it is removed from the field in time t. The value of t is ____.
0.1 sec
0.01 sec
1 sec
20 sec
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
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
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
/
G shows deflection to the left and right with constant amplitude
G shows deflection on one side
G shows no deflection.
G shows deflection to the left and right but the amplitude steadily decreases
If a copper ring is moved quickly towards south pole of a powerful stationary bar magnet, then ____.
Current flows through the copper ring
Voltage in the magnet increase
Current flows in the magnet
Copper ring will get magnetized
In a magnetic field of 0.05T, area of a coil changes from to without changing the resistance which is 2(. The amount of charge that flow during this period is ____.