Determine the direction of the force (if any) that will act on the charge in eac

Question

Determine the direction of the force (if any) that will act on the charge in each of the following situations. A positive charge within an electric field that points upward. A negative charge within an electric field that points to the right. A positive charge moving to the right in a magnetic field that points out of the screen. A negative charge moving upward in a magnetic field that points into the screen. A positive charge moving to the right in an electric field that points out of the screen A negative charge moving downward in a magnetic field that points downward. zero forceupwarddownward out of the screento the leftto the rightinto the screen

Explanation / Answer

Elctric force Fe = E*q

magnetic force Fb = q *( V X B )

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Fe = Ej*q

Fe = Eq j

Upward

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Fe = Ei*-q

Fe = -Eq i

to the left

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Fb = q*(vi X Bk)

Fb = qvB -j

downward

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Fb = -q*( vj X -Bk)

Fb = qvB i

to the right

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Fe = q*Ek

out of screen

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Fb = -q*( -vj X-Bj)

Fb = 0

zero force

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Fb = i*( l X B )

Fb = 7.9*( 0.55 i X -4 i)

Fb = 0

none of the above

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Fb = 4 j

4j = 7.9*(0.55i X B )

B is in -z direction

4j = 7.9*(0.55i X -B k)

4j = 7.9*0.55*B j

B = 0.92 T

-Z

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