Magnetic Fields and Forces

Which end of this solenoid will become the South pole?

• left end

• Right end

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

A 2.35 𝑚 length of wire carrying a current of 0.819 𝐴 is placed perpendicular to a magnetic field of 0.920 𝑇

as shown below. What is the magnetic force exerted on the wire?

• 0 N

• 1.77 N

• 3.6 N

• 0.95 N

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

A stationary positive charge +Q is located in a

magnetic field B, which is directed toward the right

as indicated. Which of the following is true

regarding the direction of the magnetic force on Q?

• Up

• Towards the left

• down

• out of the page

• There is no magnetic force

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

A solenoid has a uniform magnetic field 𝐵 at its

center. The number of turns in the solenoid is

doubled, and at the same time its length is doubled.

The magnetic field is now equal to______.

• B/4

• B/2

• B

• 2B

• 4B

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NGSS.HS-PS3-5

What is the direction of the magnetic field at

point 𝑃 due to the current in the wire?

• To the right

• To the left

• downwards

• into the page

• out of the page

Tags

NGSS.HS-PS2-5

Two long, parallel conductors carrying current lie

in a horizontal plane. The two conductors attract one

another. The two currents must be ______

• in the same direction

• in opposite directions

• perpendicular to each other

• parallel to the earth's magnetic field

• perpendicular to the earth's field

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

Which of the following would increase the strength of an electromagnet?

• Reduce the current

• Reduce the number of turns

• increase the radius of the coils

• wind the turns closer to each other

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NGSS.HS-PS2-5

A particle with charge q = 3.60 n𝐶 and speed 𝑣 = 862 𝑚/𝑠, travels at right angles to a uniform magnetic

field. The magnetic force it experiences 𝑖𝑠 3.17 x 10^-3 N . Find the strength of the magnetic field.

• 1021 T

• 1.02 x 10^-6 T

• 9.8 T

• 9.8 x 10^-9 T

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NGSS.HS-PS3-5

A long, straight wire is carrying a current of 5.0 A. At what distance away from the wire would the magnetic field be 2.5 x 10^-5 T?

• 0.8 m

• 0.04 m

• 0.02 m

• 4 m

• 0.5 m

Tags

NGSS.HS-PS2-4

NGSS.HS-PS2-5

If an electron speed is 2.80 x 10⁶ 𝑚/𝑠 enters a magnetic field of strength 4.31 x 10^-3 T , what is

the radius of the circular path taken by the electron? charge of an electron is 1.6 x 10^-19 C and its mass is 9.11 x 10^-31 kg.

• 469 m

• 0.025 m

• 3.7 x 10^-3 m

• 3.7 x 10¹⁵ m

• 190 m

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NGSS.HS-PS2-5

NGSS.HS-PS3-5