Chapter 19 Questions

Question 1

When you see this card, open up the chapter 19 conceptual questions and practice the right hand rules AND all the image based problems

Question 2

Know that electrons or negative charges do not obey the RH rule

Answer 2

The correct answer will be the opposite of whatever you get using the RH rule

Question 3

True or false? The magnetic force on the wire is independent of the direction of the current.

Answer 3

false

Question 4

True or false? The force on the wire is directed perpendicular to both the wire and the magnetic field

Answer 4

true

Question 5

The force takes its largest value when the magnetic field is parallel to the wire

Answer 5

false (perpendicular!)

Question 6

What do you know about coax cables?

Answer 6

coax cables are used because the magnetic field outside the outer conductor is canceled by the equal/opposite currents running through the inner and outer cables

also, magnetic fields circulate around current carrying wires, with a magnitude inversely proportional to the radius and direction given by the RH rule

Question 7

Two charged particles are projected into a region where a magnetic field is directed perpendicular to their velocities. If the charges are deflected in opposite directions, what are the possible relative charges and directions? (two options)

Answer 7

Same charge, opposite directions

opposite charge, same directions

Question 8

A charged particle moves in a straight line through a region of space. Which of the following must be true?

Answer 8

the magnetic field has a zero component perpendicular to the particle’s velocity

Question 9

The north pole end of a bar magnet is held near a stationary positively charged piece of plastic. How is the plastic affected?

Answer 9

The plastic is unaffected by the magnet

Question 10

A square and circular loop with the same area lie in the xy plane, where there is a uniform magnetic field B pointing some angle theta with respect to the positive Z direction. Each loop carries the same current in the same direction. Which torque is larger?

Answer 10

the torques are equal

Question 11

as a charged particle moves freely in a circular path in the presence of a constant magnetic field applied perpendicular to the particle’s velocity, the particle’s kinetic energy _______

Answer 11

remains constant

Question 12

Which of the following actions would double the magnitude of the magnetic force per unit length between two parallel current carrying wires?

Answer 12

reduce distance by half
double ONE of the currents