In the figure shown, ' R ' is a fixed conducting fixed ring of negligible resistance and radius ' a '. PQ is a uniform rod of resistance 
. It is hinged at the centre of the ring and rotated about this point in clockwise direction with a uniform angular velocity 
. There is a uniform magnetic field of strength ' B ' pointing inwards, ' r ' is a stationary resistance, then –
A
Current through ' r ' is zero
B
Current through ' r ' is 
C
Direction of current in external ' r ' is from centre to circumference
D
Direction of current in external ' 
' is from circumference to centre
' is from circumference to centre
Text Solution
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CHECK THE SOLUTION.
(b, d)
Equivalent circuit
By nodal equation, nodal
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