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 = BωL2−BωL22=BωL22.