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Magnetism

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4 Jan 2008 00:35:26 IST

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QUESTION ABOUT MUTUAL INDUCTION

None

TWO COILS X AND Y ARE PLACED IN A CIRCUIT SUCH THAT CURRENT CHANGES BY 2 AMP IN X AND MAGNETIC FLUX CHANGES BY 0.4 WB IN Y.THE VALUE OF MUTUAL INDUCTION IS

A)0.2 HENRY

B)0.2 WEBER

C)0.8HENRY

D)5 HENRY

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Aditya Arora

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4 Jan 2008 00:40:23 IST

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I hope the answer is a)

FARISHTA SONAWANE

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4 Jan 2008 00:44:51 IST

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BUT WHICH FORMULA TO USE ADITYA

Krishna Gopal Singh

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4 Jan 2008 12:45:20 IST

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flux = M*i
So M = change in flux/change in current. (a) is the right answer

Aditya Arora

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4 Jan 2008 12:50:31 IST

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Hi,

Look,

i am designating flux by f

So, For two coils,

f = Mi [ M is mutual inductance, i is current ]

Differentiate both sides w.r.t to time

So,

df/dt = M*di/dt

You have given that, df/dt = 0.4 Weber and di/dt = 2 Ampere

So, we get M = 0.2 Henry

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