Three students are discussing the situation shown in the figure at the right. Th

Question

Three students are discussing the situation shown in the figure at the right. There is a conducting loop with an ammeter that is sitting in a constant uniform magnetic field. The conducting loop has a second part which can be added to the loop by changing the position of a switch. The students are discussing whether the ammeter will register when the switch is changed to make the larger loop. Allie: "I think the needle will swing left because the induced field will oppose the initial field which is into the page and will increase when the switch is moved." Bill: "No the needle will swing right because the induced field will oppose the change in the flux through the loop which will increase since the area of the loop will increase." Colin: "I disagree with both of you since I don't see any part of the loop moving, nor the magnetic field strength changing, so no movement of the needle." With which, if any, of these students do you agree? Allie___ Bill___ Colin___ None of them___ Explain.

Explanation / Answer

we should agree with Bill. because whenever there is some change in the flux (flux=magnetic fieldXarea) current will be induced. and the induced current direction will be such that it opposes the change that has induced it. (LenZ's law)

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