A wire of length 1 m is moving at a speed of 2 ms⁻¹ perpendicular to its length
A wire of length 1 m is moving at a speed of 2 ms⁻¹ perpendicular to its length in a homegeneous magnetic field of 0.5 T. If the ends of the wire are joined to […]
Physics
In circular coil, when number of turns is doubled and resistance becomes 1/4th
In circular coil, when number of turns is doubled and resistance becomes 1/4th of initial value, the inductance becomes
Options
(a) 8 times (b) 2 times (c) 4 times (d) No change
Correct […]
If emf induced in a coil is 2 V by changing the current in it from 8 A to 6 A
If emf induced in a coil is 2 V by changing the current in it from 8 A to 6 A in 2×10⁻³ s, then the coefficient of self-induction is
Options
(a) 2×10⁻³ H […]
Two coils have the mutual inductance of 0.05 H.
Two coils have the mutual inductance of 0.05 H. The current changes in the first coil as I=I₀ sin ωt, where I₀=1 A and ω=100π rad/s. The maximum emf induced in secondary coil is
An avarage induced e.m.f. of 1 V appears in a coil when the current in it is changed
An avarage induced e.m.f. of 1 V appears in a coil when the current in it is changed from 10 A in one direction to 10A in opposite direction in 0.5 sec. Self inductance of […]
When a magnet is taken towards a coil, the induced e.m.f. depends on
When a magnet is taken towards a coil, the induced e.m.f. depends on
Options
(a) the number of turns in the coil (b) the speed of the magnet (c) the resistance of the coil […]
Two identical circular coils A and B are kept on a horizontal tube
Two identical circular coils A and B are kept on a horizontal tube side by side without touching each other. If the current in the coil A increases with time, in response, the coil B […]
The induced emf in a coil of 10 H inductance in which current varies
The induced emf in a coil of 10 H inductance in which current varies from 9 A to 4 A in 0.2 s is
Options
(a) 200 V (b) 250 V (c) 300 V […]
If a charge in current of 0.01 A in one coil produces a change in magnetic flux
If a charge in current of 0.01 A in one coil produces a change in magnetic flux of 1.2 x 10⁻² Wb in the outer coil, then the mutual inductance of the coils in henry […]
The current in a self-inductance L=40 mH is to be increased uniformly from 1A to 11 A
The current in a self-inductance L=40 mH is to be increased uniformly from 1A to 11A in 4 ms. The emf indued in the inductor during the process is
Options
(a) 100 V (b) […]