Physics 121 General Physics
Concept Quizzes
Chapter 29 Magnetic Fields

A proton (a particle with a positive charge) is moving towards the east in a uniform magnetic field that points straight downwards. The Lorentz force that acts on the proton is

	zero.
	directed downward.
	directed towards the south.
	None of the above.

A vertical wire carries a current straight up in a region where the magnetic field vector points due north. What is the direction of the resulting force on the wire?

	Down.
	North.
	East.
	West.

A rectangular loop is placed in a uniform magnetic field with the plane of the loop perpendicular to the direction of the field. If a current is made to flow through the loop in the sense shown, the field exerts on the loop

	a net force.
	a net torque.
	a net force and a net torque.
	neither a net force nor a net torque.

A rectangular loop is placed in a uniform magnetic field with the plane of the loop parallel to the direction of the field. If a current is made to flow through the loop in the sense shown, the field exerts on the loop

	a net force.
	a net torque.
	a net force and a net torque.
	neither a net force nor a net torque.