If you see the symbols x and o (or a dot), these mean: A) x means into the page,

Question

If you see the symbols x and o (or a dot), these mean:

A) x means into the page, o means out of the page
B) x means out of the page, o means into the page
C) x means left on the page, o means right on the page
D) x means up on the page, o means down on the page
E) x means right on the page, o means left on the page
F) you're looking at a tic-tac-toe game, not a physics textbook!

5.

Somewhat Near the earth's north pole (for rotation) is the Earth's

A) South magnetic pole
B) North magnetic pole
C) + end of its electric dipole
D) - end of its electric dipole

6.

You are looking down a wire that has current going directly away from you. Its magnetic field lines would be best described, from your perspective, as

A) circular & clockwise
B) circular & counterclockwise
C) radially outwards from the wire
D) radially inwards towards the wire
E) directly towards you
F) directly away from you

7.

You are a distance D from a wire carrying current. You then move to a distance 2D. You now experience

A) twice the B field as before
B) half the B field as before
C) the same B field as before
D) four times the B field as before
E) one-fourth the B field as before

Explanation / Answer

4. A) X means into the pase, O means out of the page
5. As north pole of any magnet points towards geometric north, hence the magnetic south must be located there.
A) South magnetic pole

6. From the right hand rule, A) Circular and clockwise
7. B due to a long current carrying conductor is B = 2kI/d
when d becomes 2d, B is halved
B) Half the B field that of before

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