PHYS 1260 Exam 2 Conceptual Review (DeWitt)

When two lamps are connected in parallel to abattery, the electrical resistance that the battery"senses" is

B) less than the resistance of either lamp.

Surrounding every moving electron is

a magnetic field and an electric field

When a change occurs in the magnetic field in a closed loop of wire

a voltage is induced in the wire, a current is created in the loop of wire, and electromagnetic induction occurs

Surrounding every stationary electron is

an electric field

The direction of the force exerted on a movingcharge in a magnetic field is

at right angles to the direction of the motion

Like kinds of magnetic poles repel while unlike kinds of magnetic poles

attract.

Whereas electric charges can be isolated, magnetic poles

cannot.* *Nothing in classical electrodynamic theory or quantummechanics says that magnetic monopoles can't exist.

The shape of a magnetic field surrounding a current-carrying conductor is

circular.

Compared to the huge force that attracts an iron tack to a strong magnet, the force that the tack exerts on the magnet is

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

exactly 100 N

The frequency of induced voltage in a wire coil depends on

how frequently a magnet dips in and out of thecoil

When two lamps are connected in series to abattery, the electrical resistance that the battery"senses" is

more than the resistance of either lamp.

On some early automobiles both headlights failed when one bulb burned out. The headlights were likely connected in

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

twice