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Question

Swastick shown in figure is rotating at angular velocity of ω about O in a uniform magnetic field B perpendicular to the plane of the paper. Here, oa = oe = og = hg = ab = oc = cd = ef = L.

A
Potential difference between a and e is 2BωL2
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B
Potential difference between a and c is BωL2
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C
Potential difference between b and e is BωL22
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D
Potential difference between e and g is zero
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Solution

The correct options are
C Potential difference between b and e is BωL22

D Potential difference between e and g is zero
Potential of points a, c, e and g is Bωl22 & Potential of points b, d, f and h is BωL2.
So, potential difference across ae and ag = 0 and,
Hence, potential difference across ab = BωL2BωL22=BωL22.

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