1) The magentic force between the two infinitely long current-carrying parallel
ID: 1473243 • Letter: 1
Question
1) The magentic force between the two infinitely long current-carrying parallel wires placed at distance d from each other is proportional to:
A. 1/2d
B. 1/d
C. d^2
D. 1/the square root of d
E. 1/d^2
2) Where will the image be located, if the object is infinitely far from a converging lens with focal length f?
A. on the focal plane on the same side of the lens as the object
B. On the focal plane on the other side of the lens
C. Infinitely far, on the other side of the lens
D. At a distance of 2f on the other side of the lens
Explanation / Answer
1)
B. 1/d
The magnetic force between two wires is:
F = u L i1 i2/d
2)
B. On the focal plane on the other side of the lens
We have:
1/i = 1/o - 1/f
==> 1/i = 1/infinity - 1/f
==> i = -f
So the image is on the focal plane on the other side of the lens.
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