1.Current in a 10 milli henry coil increases uniformly from zero to one ampere in 0.01 second, then the value of induced e. m. f. is

2.A resistor and an inductor are connected to an ac circuit whose supply is 200 V. An ac voltmeter across R reads 150 V. This voltmeter across inductor will read nearly

3.In LR circuit, the time constant is given by

4.The current drawn from the primary of a transformer which steps down 220 V to 22 V at 0.1 amp. Shall be

5.A copper plate flat pendulum and a copper plate pendulum with slots in it but of same dimension, are made to oscillate in a magnetic field. Then