An induction coil stores 32 joules of magnetic energy and dissipates energy as heat at the rate of 320 watts. When a current of 4 amperes is passed through it. Find the time constant of the circuit when the coil is joined across a battery.

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Q. An inductor coil stores

32 J

of magnetic field energy and dissipates energy as heat at the rate of

320 W

when a current of

4 A

is passed through it. Find the time constant of the circuit when this coil is joined across an ideal battery.

Q. An inductor coil stores

64 J

of magnetic field energy and dissipates energy at the rate of

640 W

when a current of

8 A

is passed through it. If this coil is joined across an ideal battery, find the time constant of the circuit, in seconds.

Q. i) a transformer is used to light 140 watt 24 volt lamp from 240 volt AC mains. the current in the main cable is 0.7 A. the efficiency of the transformer is?
ii) an inductor coil stores 32J of magnetic field energy & dissipates energy as heat at the rate of 320 W, when a current of 4 A is passed through it. the time constant of the circuit when this coil is joined across an ideal battery will be?