In Figure A, a loop of wire is laying flat in the plane of the screen in a magne

ID: 1593752 • Letter: I

Question

In Figure A, a loop of wire is laying flat in the plane of the screen in a magnetic field as shown. In Figure B, a loop of wire is laying flat in the plane of the screen to the side of an infinitely long wire. In each situation, decide whether or not there is an induced emf in the appropriate loop during the action described. 'emf' means there was a non-zero induced emf. 'No emf' means there was no induced emf in the coil.

The loop in Figure A is moved towards the left side of the page.

In Figure B the current through the wire is kept constant at 3A to the right while the loop is moved towards the bottom of the screen towards the wire.

In Figure B the current in the wire starts at zero and is increased until 5A of current flows towards the right of the page while the loop is held stationary.

The loop in Figure A is moved towards the top of the page.

In Figure B the current through the wire is kept constant at 3A to the right while the loop is moved to the right parallel to the wire.

Explanation / Answer

Ans:a)No emf; The magnatic field in Fig A does not change in the laft-right direction but it changes in the top-bottom direction(because cross marks number increases) so there will be no emf if the loop is moved towards left.

b)Emf ; The magnatic field produced by a current carrying wire varies inversely with the distance from the wire.So in the top -bottom direction there is change in magnatic field So , there will be a induced emf.

c)Emf; Since the current in the wire start increasing from 0 to 5A the magnatic field at the position of the loop changes that cause a change in flux. So emf induced in the loop.

d)Emf; From fig A we can easily see that the value of the magnatic field changes along the vertial direction because the no of cross increases along the top direction and this change in magnatic field will produce a emf.

e)No emf ; Since the loop is moving parallel to the wire and the current in the wire is constant, then there will not be any change of magnatic field as seen by the loop.hence no flux change i.e no emf.

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In Figure A, a loop of wire is laying flat in the plane of the screen in a magne

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In Figure A, a loop of wire is laying flat in the plane of the screen in a magne

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