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Q.

A circuit has a self-inductance of 1 henry and carries a current of 2 A. To prevent sparking when the circuit is switched off, a capacitor which can withstand 400 V is used. The value of capacitance of the capacitor connected across the switch must be equal to

                                             

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a

25 mF                                      

b

100 mF                                    

c

12.5 mF

d

50 mF     

answer is B.

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Detailed Solution

12Li2=12CV2   L=1,V=400 C=25 μF

 

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