4.[1pt] Answer the following questions with regard to the diagram above. If the

Question

4.[1pt] Answer the following questions with regard to the diagram above. If the first is T and the rest F, enter TFFFF. A) As the rod AB moves to the right, the magnitude of the flux through the surface ABCD decreases B) The agent moving the rod to the right is doing positive work on the rod C) The induced current flows counter-clockwise D) In the absence of friction between rod and rail, the rod will continue to move towards the right indefinitely even if no external force is applied to keep it in motion E) The magnetic field due to the INDUCED current points within the loop ABCD into the plane of the paper

Explanation / Answer

A) as area of loop is decreasing so flux is decreasing

B) the agent is applying the force in direction of motion . this implies positive work

C) as the field is into the plane of paper and flux is decreasing so according to lenz's law the loop will induce current such that it will oppose the change in flux. i.e. induced current will produce field into the plane and for that current has to be clockwise.

D) No, as the magnetic force acting opposite to agent force will deaccelarate the rod and finally took it to rest and then move backwards.

E) as explained in (C)

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