AP Physics 2 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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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

Magnetic field lines can also be called ______ lines

• electromagnetic

• invisible

• flux

• quantum

A/n ________ magnet is a magnet that retains it magnetism for a long time

• infinity

• perpetual

• enduring

• permanent

This diagram shows

• current into the page

• current out of the page

• magnetic field into the page

• magnetic field out of the page

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