A long, straight, horizontal wire in the plane of the computer screen has a curr

Question

A long, straight, horizontal wire in the plane of the computer screen has a current flowing to the left. A metal loop, also in the plane of the computer screen, is falling downwards (velocity down, acceleration down) due to the force of gravity. What direction is the magnetic force on the loop? Question 7 options: A) Right, the the plane of the screen. B) Right and Up, in the plane of the screen. C) Up, in the plane of the screen D) Left and Up, in the plane of the screen E) Left, in the plane of the screen F) Left and Down, in the plane of the screen G) Down, in the plane of the screen H) Right and Down, in the plane of the screen I) Into the plane of the screen J) Out of the plane of the screen K) Clockwise, in the plane of the screen L) Counter Clockwise, in the plane of the screen M) Zero. There is no direction because the quantity in the question has zero magnitude

Explanation / Answer

As it falls this way the magnetic field going out of the page will decrease as its getting further away from the wire. It doesnt want the flux to change so it will make its only induced magnetic field out of the page, which means a current counter clockwise so the top has current going to the left and the bottom to the right using RHR, the top will feel a force up and the bottom a force down the top is closer so B is higher so F is higher so the net force will be up. C)

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