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JEE Main 202226 JuneMorning Shift
Exam
JEE Main
Year
2022
Date
26 June
Shift
Morning Shift
Subject
Physics
Chapter
Electromagnetic Induction

JEE Main 2022 · 26 June · Morning Shift · Physics · Electromagnetic Induction

A 10Ω, 20mH coil carrying constant current is connected to a...

A 10Ω,20mH10Ω, 20mH coil carrying constant current is connected to a battery of 20V20V through a switch. Now after switch is opened current becomes zero in 100\mus100\mus. The average e.m.f. induced in the coil is _____ VV.

Correct answer

0

Step-by-step solution

The initial current in the coil will be, i=VR=2010=2Ai = \dfrac{V}{R} = \dfrac{20}{10} = 2A.

Average e.m.f. developed in the coil will be,

ε=−∆ϕ∆t=0−Lit=20×10−3×2100×10−6=400Vε = - \dfrac{∆ ϕ}{∆ t} = \dfrac{0 - Li}{t} = \dfrac{20 \times {10}^{- 3} \times 2}{100 \times {10}^{- 6}} = 400V.

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