× ×bx A metal wire is resting on a U-shaped conducting rail. The wire is free to

Question

× ×bx A metal wire is resting on a U-shaped conducting rail. The wire is free to move. If the magnetic field is increasing, the wire will move to the right. Demonstrate thisXxx by sketching a diagram of the situation, showing clearly: 4. xX a. b. c. d. The direction of the induced current in the loop The direction of the current in the metal wire. The direction of the force of the applied field on the wire. An explanation of the situation using Lenz's Law: How does the motion of the loop oppose the change in flux? Fixed rail Wire

Explanation / Answer

4. (a) field is into the page. and area will increase as wire moves to right.

so flux will increase.

to cancel its effect, induced current will be like that field due to it will be out of page.

Ans: COunter clock wise

(B) Upward

(C) magnetic force = IL X B

that will be to the left .

hence applied force will be to the right.

(D) field is into the page. and area will increase as wire moves to right.

so flux will increase.

to cancel its effect, induced current will be like that field due to it will be out of page. SUCH that flux remains same.

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