Question

A charged particle is moving north when it enters a uniform magnetic field pointing from east to west. If the force experienced by the particle is vertically downward, the charge on the particle is

	a.	positive
	b.	negative
	c.	The force is independent of the charge.
	d.	Not enough information given.

The magnetic pole in Antarctica is a ______________ magnetic pole

	a.	North
	b.	South
	c.	It changes from year to year.
	d.	It depends on the time of year.

Kirchoff's Rules can be thought of as statements of conservations laws applied to circuits with multiple loops. Kirchoff's junction rule is a statement of

	a.	Conservation of Charge
	b.	Conservation of Momentum
	c.	Conservation of Energy
	d.	Conservation of Flux

Answer 1

(A): Force experienced by the charge particle in a magnetic field is  , where direction is given by right hand rule. Here the the direction of force is coming out to be upward (by putting right hand fingers in north direction, the direction of velocity of charge and curling them towards west in the direction of magnetic field the thumb is pointing upward) but, as given in question, the charge is moving downward it has to be negatively charged.

Answer: (b) Negative

(B): The magnetic pole in Antarctica is a is actually North magnetic pole, as magnetic field lines are vertically upward in this area. So, it is geographical South but actually magnetic north.

Answer: (a) North

(C): Kirchoff's junction rule is the conservation of Charge.

Answer: (a) Conservation of Charge.