Physics 1260 Exam 2

Like kinds of magnetic poles repel while unlike kinds of magnetic poles A) attract. B) repel also. C) may attract or repel.

A) attract.

When two lamps are connected in SERIES to a battery, the electrical resistance that the battery "senses" is A) more than the resistance of either lamp. B) less than the resistance of either lamp. C) [none of these]

A) more than the resistance of either lamp.

Surrounding every stationary electron is A) a magnetic field. B) an electric field. C) [both of these] D) [neither of these]

B) an electric field.

Whereas electric charges can be isolated, magnetic poles A) can also. B) cannot. C) gather in clusters. D) [none of these]

B) cannot.

Compared to the huge force that attracts an iron tack to a strong magnet, the force that the tack exerts on the magnet is A) relatively small. B) equally huge. C) inversely proportional to their masses.

B) equally huge.

Magnet A has twice the magnetic field strength of Magnet B and at a certain distance pulls on magnet B with a force of 100 N. The amount of force that magnet A exerts on magnet B is A) at or about 50 N. B) exactly 100 N. C) [need more information]

B) exactly 100 N.

The frequency of induced voltage in a wire coil depends on A) the frequency of current producing it. B) how frequently a magnet dips in and out of the coil. C) the number of loops in the coil.

B) how frequently a magnet dips in and out of the coil.

When two lamps are connected in PARALLEL to a battery, the electrical resistance that the battery "senses" is A) more than the resistance of either lamp. B) less than the resistance of either lamp. C) [none of these]

B) less than the resistance of either lamp.

Surrounding every moving electron is A) a magnetic field. B) an electric field. C) [both of these] D) [neither of these]

C) [both of these] This magnetic field is a result of "distortions" in the electric field caused by the motion of the electron.

The direction of the force exerted on a moving charge in a magnetic field is A) in the direction of the motion. B) opposite its motion. C) at right angles to the direction of the motion.

C) at right angles to the direction of the motion.

The shape of a magnetic field surrounding a current- carrying conductor is A) consistent with the inverse-square law. B) radial. C) circular. D) [all of these] E) [neither of these]

C) circular.

On some early automobiles both headlights failed when one bulb burned out. The headlights were likely connected in A) parallel. B) perpendicular. C) series. D) haste.

C) series.

When a magnet is moved to and fro in a wire coil, voltage is induced. If the coil has twice as many loops, the voltage induced is A) half. B) the same. C) twice. D) four times as much. E) [none of these]

C) twice.

When a change occurs in the magnetic field in a closed loop of wire A) a voltage is induced in the wire. B) a current is created in the loop of wire. C) electromagnetic induction occurs. D) [all of these] E) [none of these]

D) [all of these]