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Q.

A current in a 240 turn solenoid varies at 0.8A/s. Find emf induced in the solenoid,if the length of the solenoid is 12 cm and radius 2 cm

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a

6.14×10−4V

b

6.14×10−6V

c

6.14×10−2V

d

6.14V

answer is A.

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Detailed Solution

ε=Ldidt     =μ0N2(πr2)ldidt    =4π×10−7×(240)2×(π)(2×10−2)2×0.812×10−2    =6.14×10−4V
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A current in a 240 turn solenoid varies at 0.8A/s. Find emf induced in the solenoid,if the length of the solenoid is 12 cm and radius 2 cm