A long solenoid S has n turns per metre, with diameter a. At the centre of this coil, we place a smaller coil of N turns and diameter b (b < a). If the current in the solenoid increases linearly with time, then the emf will be induced in the smaller coil. Which of the following is the correct graph showing | 
| verses t if current varies as a function of mt 2 + C ?
Text Solution
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As per the data given in the question magnetic field due to current in solenoid S, 
Magnetic flux linked with the smaller coil due to this field is
NBA, where, a = area of smaller coil 
emf induced in the smaller coil,
As current I varies as a function of 
From (i), 
So correct option is
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