JEE Main 2022 · 26 Jun · Shift 1 · Physics Q55

← JEE Main 2022 · 26 Jun · Shift 1

PhysicsInteger+4 / -1Question 55 of 90

A $10\ \Omega$ , 20 mH coil carrying constant current is connected to a battery of 20 V through a switch. Now after switch is opened current becomes zero in 100 $\mu$ s. The average e.m.f. induced in the coil is ______ V.

Your answer

Answer and worked solution

Official answer: 400

Current. $I=\dfrac{20}{10}=2$ A.

Average emf. $L\dfrac{\Delta I}{\Delta t}=0.02\times\dfrac2{10^{-4}}=400$ V.

Answer: 400

Topics:Self inductance

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JEE Main 2022 · 26 Jun · Shift 1, Physics question 55