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# In a Given Coil of Self-inductance of 5 Mh, Current Changes from 4 a to 1 a in 30 ms. Calculate the Emf Induced in the Coil. - CBSE (Science) Class 12 - Physics

#### Question

In a given coil of self-inductance of 5 mH, current changes from 4 A to 1 A in 30 ms. Calculate the emf induced in the coil.

#### Solution

Self inductance, L=5 mH=5×103 HChange in current,

dI=(14)=3 A

Change in time, dt=30 ms=30×10−3 s

The emf induced in the coil is given by  e=−L(dI)/(dt)

⇒e=((−5xx10^(−3) )xx(−3))/(30×10^(−3))

⇒e=0.5 V

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Solution In a Given Coil of Self-inductance of 5 Mh, Current Changes from 4 a to 1 a in 30 ms. Calculate the Emf Induced in the Coil. Concept: Inductance - Self-Inductance.
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