AP Physics Electricity and Magnetism

The magnetic force on a charged particle is in the direction of its velocity if

• it is moving in the direction of the field

• it is moving opposite to the direction of the field

• it is moving perpendicular to the field

• it is moving in some other direction

• never

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What is a ferromagnetic material?

• A material which is exhibits very strong magnetic effects.

• A material which is exhibits very weak magnetic effects.

• A material which is exhibits no magnetic effects.

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Lines of the magnetic field produced by a long straight wire carrying a current are

• in the direction of the current

• opposite to the direction of the current

• outward from the wire

• inward toward the wire

• circles that are concentric with the wire

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A magnetic field CANNOT

• exert a force on a charged particle

• change the velocity of a charged particle

• change the momentum of a charged particle

• change the kinetic energy of a charged particle

• change the trajectory of a charged particle

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A magnetic field exerts a force on a charged particle:

• always

• never

• if the particle is moving across (or perpendicular) the field lines

• if the particle is moving along (or parallel) the field lines

• if the particle is at rest

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A wire in the plane of the page carries a current directed toward the top of the page as shown. If the wire is located in a uniform magnetic field B directed out of the page, the force on the wire resulting from the magnetic field is

• directed to the left

• directed out of the page

• directed to the right

• zero

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The direction of the magnetic field at point R caused by the current I in the wire shown is

• to the left

• to the right

• into the page

• out of the page

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Quadrupling the current in a circuit with constant resistance has the effect of changing the power by what factor?

• 1/4

• 1/9

• 16

• 4

Capacitance is:

• measure in farads

• the ratio of the magnitude of the charge on either conductor of a capacitor to the magnitude of the potential difference between the conductors.

• constant for a parallel plate capacitor

• all three choices.

The total capacitance of several capacitors in parallel is the sum of the individual capacitances for which of the following reasons?

• The charge on each capacitor depends on its capacitance, but the potential difference across each is the same.

• The charge is the same on each capacitor, but the potential difference across each capacitor depends on its capacitance.

• Capacitors in a circuit always combine like resistors in series.

• The parallel combination increases the effective separation of the plates.