In Figure A, a loop of wire is laying flat in the plane of the screen in a magne
ID: 1593774 • 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
To induce an emf the relative variation of the magnetic flux is needed
To induce an emf must pass one of three situations.
1 Change the magnitude of the magnetic field
2. The area enclosed by the loop changes over time
3. The angle between the normal vector to the loop and the magnetic field changes
The loop in Figure A is moved towards the left side of the page
1 Change the magnitude of the magnetic field -----------It does not happen
the magnetic field is constant leftward
2. The area enclosed by the loop changes over time----------It does not happen
the area of loop does not vary
3. The angle between the normal vector to the loop and the magnetic field changes--------It does not happen
The loop is not inclined
Answer
no induced emf
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.
1 Change the magnitude of the magnetic field -----------this happens
the magnetic field varies with the distance to the wire
2. The area enclosed by the loop changes over time----------It does not happen
the area of loop does not vary
3. The angle between the normal vector to the loop and the magnetic field changes--------It does not happen
The loop is not inclined
Answer
is induced an emf
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.
1 Change the magnitude of the magnetic field -----------this happens
with increasing current, the magnetic field varies
2. The area enclosed by the loop changes over time----------It does not happen
the area of loop does not vary
3. The angle between the normal vector to the loop and the magnetic field changes--------It does not happen
The loop is not inclined
Answer
is induces an emf
The loop in Figure A is moved towards the top of the page.
1 Change the magnitude of the magnetic field -----------this happens
upward the magnetic field changes therefore fulfills the condition
2. The area enclosed by the loop changes over time----------It does not happen
the area of loop does not vary
3. The angle between the normal vector to the loop and the magnetic field changes--------It does not happen
The loop is not inclined
Answer
is induces an emf
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.
1 Change the magnitude of the magnetic field -----------It does not happen
the magnetic field parallel to the wire does not change so does not change the magnetic field in the loop
2. The area enclosed by the loop changes over time----------It does not happen
the area of loop does not vary
3. The angle between the normal vector to the loop and the magnetic field changes--------It does not happen
The loop is not inclined
Answer
no induced emf
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