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

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. 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 left side of the page. 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 towards the bottom of the screen towards the wire. 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

1. On increasing the current in the wire the magnetic flux linking with loop also increases according to

Ampere's right hand grip rule. Hence there is induced ----emf

2. When loop moves left or right the flux linking with the coil does not change. hence ------no emp

3. When coil moves towards top there is increase in flux, hence there is ------emf

4.As the loop is coming down the flux inking with the coil increases -------emf

5.When loop moves horizontal the flux linking with coil does not change -----no emf

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