Question

A thin uniform rod with negligible mass and length I is attached to the floor by a frictionless hinge
at point P. A horizontal spring with force constant k connects the other end to wall. The rod is in
a unifrom magnetic field B directed into the plane of paper. What is the extension in spring in
equilibrium when a current is passed through the rod in direction shown ? Assuming spring to be
in natural length initially and it remains perpndicular to wall always.
5ilB
a)
Sk
B
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B
O-wwW
3ilB
b)gk
530
P
Hinge n
5ilB
c)Ak
Spring in equilibrium position
Spring in relaxed position
5ilB
d) 6k
​

Answer 1

Answer:

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