EMI 3
Consider a cylindrical region containing a magnetic field.
The field is directed into the plane of the screen and is changing at a constant rate K (K>0)
A metallic rod (AB) is placed as shown, at a distance d from the center. The length of the rod is L .
(O is not connected to the rod, just ignore the vertical line from O to the rod)
The rod is completely contained within the circle.
Find the potential difference between points B and A when the net electric field in the rod becomes zero.
i.e find,
DETAILS
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d = 2 m
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L = 2m
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K = 1
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If your answer is negative (say, negative 3) write it as -3
HINT
Scalar potential is defined for one type of electric field only.
The answer is 2.
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1 solution
Easy question. Just join AO and OB and this will be loop for our calculations. EMF across the loop AOB is = 2 L d d t d B
Now we are taking the direction of electric field as tangential. Hence there is no EMF across AO and OB.
So we finally say that EMF across loop AOB=EMF across AB= 2 L d k