In fig, CODF is a semicircular loop of a conducting wire of resistance R and radius r. It is placed in a uniform magnetic field B, which is directed into the page (perpendicular to the plane of the loop).
The loop is rotated with a constant angular speed ω about an axis passing through the centre O, and perpendicular to the page. Then the induced current in the wire loop is
A
zero
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
The area swept by radius OC in one half circle is 
. The flux change in time 
is thus ( 
). The induced emf is then 
The induced current is then 
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