A Conducting Rod Is Sliding on Metal Rails with Velocity

A conducting rod is sliding on metal rails with velocity v.A magnetic field B is into the paper,the separation of the rails is L,and the resistance of the circuit is R.In what direction in the diagram is the current flowing in the resistor?

A) up
B) down
C) up then down
D) down then up
E) Insufficient information given,

Correct Answer:

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