The physics212lecture17slide 12 checkpoint1a a copper

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Unformatted text preview: re looking from the right. Suppose the loop is moving to the right. The current induced in the loop is: A. zero B. clockwise C. counterclockwise “Since the loop is not rotating there is a constant B*dA. d(B*dA)/dt is zero” “The current induced must cause a B field that opposes the flux. Since there is The an increasing flux to the left in this case, the induced current will be clockwise to induce a magnetic field to the right.” induce “The current induced in the loop will create a magnetic flux that will oppose The the magnetic field that created it.” the Physics 212 Lecture 17, Slide 12 Checkpoint 1a A copper loop is placed in a uniform magnetic field as shown. You are looking from the right. Suppose the loop is moving to the right. The current induced in the loop is: A. zero B. clockwise C. counterclockwise • Motional emf is ZERO • v X B = 0 • no charge separation • no E field • no emf • The flux is NOT changing • B does not change • the area does not change • the orientation of B and A does not change Physics 212 Lecture 17, Slide 13 Checkpoint 1b A copper loop is placed in a uniform magnetic field as shown. You are looking from the right. Now suppose the that loop is stationary and that the magnetic field is Checkpoint 1b decreasing in time. The current induced in the loop is: A. zero B. clockwise C. counterclockwise “No motion means no current is being induced.” “It will want to increase flux in the opposite direction, ie the direction of the It original field.” original “The induced current opposes the change in flux, and since the B-field The induces a clockwise current, the changing B-field will result in a counterclockwise current.” counterclockwise Physics 212 Lecture 17, Slide 14 Physics 212 Lecture 17, Slide Checkpoint 1b A copper loop is placed in a uniform magnetic field as shown. You are looking from the right. Looking from right X X X X X X X X Now suppose the that loop is stationary and that the magnetic field is Checkpoint 1b decreasin...
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