Alternating Cur...

A conducting square loop of side L and resistance R moves in its plane with a uniform velocity v perpendicular to one of its sides. A magnetic induction B constant in time and space, pointing perpendicular and into the plane of the loop exists everywhere with part of the loop outside the field, as shown fig. the induced e.m.f is

For the LR circuit shown in fig the phase angle if frequency is 100/π is

As shown in fig P and Q are two co-axial conducting loops separated by some distance. When the switch S is closed, a clockwise current I_p flows in P(as seen by E), an and induced current IQ₁ flows in Q. The switch remains closed for a long time. When S is opened, a current IQ₂ flows in Q. Then the direction IQ₁ and IQ₂ (as seen by E) are.

A short circuited coil is placed in a time varying magnetic field. Electrical power is dissipated due to the current induced in the coil. If the number of turns were to be quadrupled and the wire radius halved, the electrical power dissipated would be

Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon

when current changes from +2 A to –2 A in 0.05s, an e.m.f of 8 V is induced in a coil the coefficient of self inductance of the coil is

In an oscilating LC circuit, the maximum charge on the capacitor, is Q. The charge on the capacitor, when the energy is stored equally between the electric and magnetic field is

When an a.c. source of e.m.f. e = E₀ sin (100t) is connected across a circuit, the phase difference between the e.m.f. e and the current i in the circuit is observed to be π/4, as shown in Fig. If the circuit consists only of R-C or R- L or L- C in series, find the relationship between the two elements

In RC circuit while charging, the graph of log I versus time is as shown by the dotted line in the adjoining diagram, where I is the current. When the value of resistance is doubled, which of the solid curves best represents the variation of log I versus time?