Problem 17.42 An electron moves at speed 9.0 × 106 m/s toward the right between

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Problem 17.42

An electron moves at speed 9.0 × 106 m/s toward the right between two parallel plates, such as shown in (Figure 1) . A 0.11-T magnetic field points into the paper parallel to the plate surfaces.

Part A

Determine the magnitude of the magnetic force that the magnetic field exerts on the electron.

Express your answer to two significant figures and include the appropriate units.

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Part B

Determine the direction of the magnetic force that the magnetic field exerts on the electron.

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Part C

What should be the magnitude of an E field caused by oppositely charged plates to produce an electric force that just balances the magnetic force?

Express your answer to two significant figures and include the appropriate units.

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Part D

What should be the direction of an E field caused by oppositely charged plates to produce an electric force that just balances the magnetic force?

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Problem 17.42

An electron moves at speed 9.0 × 106 m/s toward the right between two parallel plates, such as shown in (Figure 1) . A 0.11-T magnetic field points into the paper parallel to the plate surfaces.

Part A

Determine the magnitude of the magnetic force that the magnetic field exerts on the electron.

Express your answer to two significant figures and include the appropriate units.

F =

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Part B

Determine the direction of the magnetic force that the magnetic field exerts on the electron.

Determine the direction of the magnetic force that the magnetic field exerts on the electron. upward downward

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Part C

What should be the magnitude of an E field caused by oppositely charged plates to produce an electric force that just balances the magnetic force?

Express your answer to two significant figures and include the appropriate units.

E =

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Part D

What should be the direction of an E field caused by oppositely charged plates to produce an electric force that just balances the magnetic force?

What should be the direction of an  field caused by oppositely charged plates to produce an electric force that just balances the magnetic force? upward downward

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X X X X X X X X X X X X

Explanation / Answer

a)f = QvB

f = 1.6*10^-19*9*10^6*0.11 = 15.84*10^-13 N

b) downward

c) qE = f

E = f/q = 9.9*10^6 N/C

d) upward

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