please explain what physical concept/ equation you used to get the answer A vert

Question

please explain what physical concept/ equation you used to get the answer

A vertical wire carries a current that is constantly increasing in time. What is the direction of the net force that the current in the vertical wire exerts on the induced current in the rectangular wire loop? B_wire = mu_0I/2 pi r A. left B. right C. into the page D. out of the page E. zero The figure shows a wire loop, perpendicular to the screen, and an external magnetic field. If the external magnetic field is decreasing in strength, what is the direction of the torque vector that the external magnetic field exerts on the induced current in the wire loop? A. left B. right C. out of the page D. into the page E. zero

Explanation / Answer

1) Since the current in the wire in increasing, a current counter clockwise will be induced in the loop by lenz law.

Higher magnitude of force will be on left side, so the net force is towards right as current in this side is opposite to that of long wire.

Option b.

2) By lenz law, the induced current will be top to bottom on front side of loop.

Magnetic moment m is rightward.

Torque = m x B

Outward

Option c

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