A 10 V battery connected to `5omega` resistance coil having inductance 10 H through a switch drives a constant current in the circuit. The switch is suddenly opened and the time taken to open it is 2ms. The average emf induced across the coil isA. `4xx10^(4)V`B. `2xx10^(4)V`C. `2xx10^(2)V`D. `1xx10^(4)V`

A 10 V battery connected to `5omega` resistance coil having inductance

1.	A 10 V battery connected to `5omega` resistance coil having inductance 10 H through a switch drives a constant current in the circuit. The switch is suddenly opened and the time taken to open it is 2ms. The average emf induced across the coil isA. `4xx10^(4)V`B. `2xx10^(4)V`C. `2xx10^(2)V`D. `1xx10^(4)V`
Answer» Correct Answer - D Here, curernt `I=(V)/(R)=(10)/(5)=2A` Final current, when the swithc is opened is zero. `:. (dI)/(dt)=(0-2)/(2xx10^(-3))=-1xx10^(-3) A s^(-1)` As `epsi=-L(dI)/(dt)=-10(-1xx10^(-3))=10^(4) V`

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