All of the following are accurate expressions for the units of a magnetic field

Question

All of the following are accurate expressions for the units of a magnetic field EXCEPT?

How far from the mirror should the same object be placed to produce an image that is 1/4 the size of the original object?

BONUS PROBLEMS I. All of the following are accurate expressions for the units of a magnctic field EXCEPT a) A-m b) C mls c) T d) m ls C-m 2 An object placed d, meters in front of a convex mirror with focal length-f produces an image that is the size of the original object How far from the mirror should the same object be placed to produce an image that is the size of the original object? b) 2 da c)3r d) e) 4 d

Explanation / Answer

Part 1)

Choice E is the choice with the incorrect units

For it to be correct, it would need to be Ns/Cm (The Newton was replaced with the kg)

Part 2)

Start with M = -q/p and we want M to be .25

.25 = -q/p

q = -.25p

For a convex mirror, f is negative, so

1/-f = 1/p + 1/-.25p

1/-f = .75/-.25p

1/-f = 3/-p

p = 3f

(Choice C)

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