Physics Magnetism and Induction 2025

For magnets, like poles repel each other and unlike poles

• also repel each other

• attract each other

• can disappear into nothingness

• can carry a lot of energy

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The source of all magnetism is

• tiny bits of iron

• tiny domains of aligned atoms

• the motion of electrons

• small lodestones

A strong magnet lifts a paper clip. Compared with the force the magnet exerts on the clip, the force the clip exerts on the magnet is

• much less

• slightly less

• the same because of Newton's Third Law!

• slightly more

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Magnet A has twice the field strength of Magnet B. When brought close together, the magnet that pulls harder on the other is

• magnet A

• magnet B

• both forces are equally strong

• it depends on how far apart they are

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The magnetic field lines about a current-carrying wire form

• circles

• radial lines

• eddy currents

• spirals

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A magnetic force cannot act on an electron when it

• is at rest

• moves parallel to the direction of the magnetic field lines

• both of these

• none of these

You can make an electromagnet stronger by

• increasing the amount of current through the wire

• increasing the amount of wraps/ coils made with the wire

• both of these will work

• neither of these will work

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A magnetic force acting on a beam of electrons can change

• only the direction of the electrons

• only the speed of the electrons

• both the direction and the speed

• neither the direction nor the speed

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The magnetic field surrounding Earth

• helps shield us from cosmic rays.

• is likely caused by electric currents in its interior.

• changes over time.

• All of these.

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What do the lines around this magnet represent?

• North Pole
• South Pole
• Magnetic Declination
• Magnetic Field

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