Questions
An induction coil stores 32 joules of magnetic energy and dissipates energy as heat at the rate of 320 watt when a current of 4 amp is passed through it. Find the time constant of the circuit when the coil is joined across a battery.
detailed solution
Correct option is A
U=12LI2 ; 32=12×L×42 ∴L=4Hand I2R=320⇒(4)2 R=320 ∴ R=20ΩT=L/R=420=0.2 secTalk to our academic expert!
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A loop, having area 20cm2, is made of thin copper wire. If is placed in a uniform magnetic field of induction 1.5 Tesla with its plane perpendicular to the field. If area of the loop increases to 30 cm2 in 0.5 second, average emf induced in the loop is
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