Question 1 : At the moment shown, in what direction does the force on the partic

Question

Question 1: At the moment shown, in what direction does the force on the particle point?

(A) Up
(B) Down
(C) Left
(D) Right
(E) into the screen
(F) out of the screen
(G) zero
(H) Can't be determined without knowing the sign of q

Question 2: What is the sign of q?
(A) positive
(B) negative
(C) not enough information

Please explain, answer alone is not good enough! I need to understand.

A charged particle, q, is moving in a uniform magnetic field and travels in a circle of radius R, as shown. At the moment shown, in what direction does the force on the particle point? Up Down Left Right into the screen out of the screen zero Can't be determined without knowing the sign of q What is the sign of q? positive negative not enough information

Explanation / Answer

1) can't be determined since the sign of charge q is not given

F=q(VXB)

where V is the velocity and B is the magnetic field and X is the cross product

so the dirtection of force will depend on the sign of q

2)can't be determined since the nothing is given to us

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