The current in an inductor of self-inductance \(4\) H changes from \(4\) A to \(2\) A in \(1\) s. The e.m.f. induced in the coil is:
1. \(-2\) V
2. \(2\) V
3. \(-4\) V
4. \(8\) V
The dimensions of mutual inductance (M) are:
1. [M2LT-2A-2]
2. [MLT-2A2]
3. [M2L2T-2A2]
4. [ML2T-2A-2]
An inductor coil of self-inductance \(10\) H carries a current of \(1\) A. The magnetic field energy stored in the coil is:
1. \(10\) J
2. \(2.5\) J
3. \(20\) J
4. \(5\) J
Two conducting circular loops of radii are placed in the same plane with their centres coinciding. If , the mutual inductance M between them will be directly proportional to:
1.
2.
3.
4.
The magnetic flux linked with a coil (in Wb) is given by the equation \(\phi=5 t^2+3 t+60\). The magnitude of induced emf in the coil at \(t=4\) s will be:
1. \(33\) V
2. \(43\) V
3. \(108\) V
4. \(10\) V