Question

Which of the following statements is correct?

Question 1 options:

	Magnetic field lines come out of the magnetic south pole of the magnet and enter at the north pole of the magnet.
	Like poles of magnets attract each other and unlike poles repel.
	The north pole of a magnet points toward the Earth's geographic north pole.
	If you cut a bar magnet in half, you get one piece with just a north magnetic pole on it and the second piece with just a south magnetic pole on it.
	Earth's geographic north pole is a magnetic north pole.

The force caused by a magnetic field on a moving charged particle is proportional to (choose best answer)

Question 2 options:

the speed of the particle.

the magnitude of the field.

the magnitude of the charge.

the sine of the angle between the velocity and magnetic field vectors.

all of the above.

A proton is moving north at a constant horizontal velocity, and then enters a strong uniform magnetic field. Because of this field the motion of the proton begins to curve downward.

What is the direction of the magnetic field?

Question 3 options:

	Horizontally, towards the south.
	Horizontally, towards the east.
	Upward.
	Horizontally, towards the west.
	Downward.

Answer 1

1. - field lines come out of north pole : false

- like poles repels. False

- Correct

- Incorrect, each piece will have north and south pole.

- Earth' geographic pole is magnetic south pole

Ans: The north pole of a magnet points toward the earth; geographic north pole.

2. F = q (v x B)

|F| = q v B sin(theta)

Ans: all of the above

3. F = q (v X B)

q -> +v e

F^ = v^ x B^

F^ -> -k

v^ -> j

so B^ -> i

such that -k = j x i

Ans: Horizontally toward th east