A horizontal semi-circular wire of radius 
is connected to a battery through two similar springs 
and 
to an electric cell, which sends current 
through it. 
vertically downward uniform magnetic field 
is applied on the wire, as shown in the figure. What is the force acting on each spring? (Assume the force produced in the springs due to the flow of current to be negligible)
A
B
C
Bir
D
2 Bir
Text Solution
Verified by ExpertsThe correct answer is:
C
Considering the semi-circular wire of radius 
. Force acting on it is shown below
Let 
be the force exerted by each spring.
: 
BIr
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