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Solution


Q.

A 12 V battery connected to a coil of resistance 6 Ω through a switch, drives a constant current in the circuit. The switch is opened in 1 ms. The emf induced across the coil is 20 V. The inductance of the coil is                     [2023]
1 5 mH  
2 12 mH  
3 8 mH  
4 10 mH  

Ans.

(4)

Induced emf=-LdIdt

⇒  20=-L(0-2)10-3

⇒  L=10 mH