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A thin conducting rod MN of mass 20 gm, ...

A thin conducting rod MN of mass `20 gm`, length `25 cm` and resistance `10 Omega` is held on frictionless long perfectly conducting vertical rails as shown in the figure. There is a uniform magnetic field `B_0 = 4 T ` directed perpendicular to the plane of the rod-rail arrangement. The rod is released from rest at time ? = 0 and it moves down along the rails. Assume air drag is negligible. Match each quantity in List-I with an appropriate value from List-II, and choose the correct option.
[Given: The acceleration due to gravity `g = 10 m s^(−2)` and `e^(−1) = 0.4]`

A

`P rarr5,Q rarr 2, R rarr 3, S rarr 1`

B

`P rarr 3,Q rarr 1, R rarr 4, S rarr 5`

C

`P rarr 4,Q rarr 3, R rarr 1, S rarr 2`

D

`P rarr 3,Q rarr 4, R rarr 2, S rarr 5`

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