Faraday\'s Law (1) There is a magnetic field going into the page in a 8 The loop

Question

Faraday's Law (1) There is a magnetic field going into the page in a 8 The loop confined region of space. Initially, a square loop of x x X wire lies entirely within the magnetic field. The loop × × × is then pulled out of the field. Note that while the X area of the loop itself is not changing, the area of the loop that has flux is changing. moving in this direction. a) What is the direction of the current through the loop at the instant shown in the figure? b) Compare the current for these three situations: loop in motion (1) but completely within the field; (2) at the instant shown in the figure; and (3) the loop well outside the field. A long straight wire is in the plane of a rectangular conducting loop. The straight wire carries an increasing current in the direction shown. The current in the rectangle is: a) zero (2) b) clockwise c) counterclockwise

Explanation / Answer

(1) field is into the page and it is leaving field.

so flux is decreasing.

hence induced current will be such that it will oppose this change of flux.

such that field due to induced current will be into the page.

direction-> clockwise

(B) (1) no current

(2) clockwise current

(3) no current.

(2) field due to wire is into the page .

current increases so field increases => flux increases.

induced current will produce field out of page.

Ans: (c) counterclockwise

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