Two circular coils 1 and 2 are made from the same wire but the radius of the 1st coil is twice that of the 
coil. What potential difference in volts should be applied across them so that the magnetic field at their centres is the same?.
Text Solution
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Question is not correct.
The magnetic field at the center of the coil,
where 
is the radius.
, where 
is a constant.
In the first coil,
If 
As 
will not be equal to 
unless 
is different from 
and 
will not be the same.
It is wrong to ask what potential difference should be applied across them. It should be perhaps the ratio of potential differences.
In that case, 
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