vmc workshop doubt 1

JEE Main Guidance › Electricity and magnetism questions › vmc workshop doubt 1

two concentric and coplanar coils have radii a & b (>>a) as shown in figure.
Resistence of the inner coil is R.
Current in the outer coil is increased from o to i, then the total charge circulating in the inner coil is:

a) \mu(pie) i a²2 R b

b) \mu i a b2 R

c) \mu i a (pie) b²2 a R

d) \mu i b2 (pie) R

(the ans given is a)

#Physics #Electricity and magnetism

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2 Answers

Avinav Prakash ·2010-03-12 23:05:50

sandipan ..are u sure the ans doesnot have pi...in the numerator.....
or
its me who's makin da mistake

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Avinav Prakash ·2010-03-12 23:29:28

well its not dat tuff.......

flux due to outer circle(Ï†)=Î¼i2b*Ï€a²

emf=dÏ†dt

the current in inner circle(i)=emfR

thus charge in inner coil =idt=ans given .............(a)

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vmc workshop doubt 1

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