Tilted Free Fall

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73.Tilted Free Fall

+10

A pendulum bob of mass

m

and positive charge

q

hangs from a string of length

L

in a region with a uniform horizontal electric field of magnitude

E

that lies in the plane of swing. The bob is released from rest with the string vertical and the bob hanging straight down. It then swings under the combined action of gravity and the electric force. At the instant the bob first reaches the far extreme of its swing, the string suddenly breaks. Which of the following best describes the bob's trajectory immediately after the break?

AA vertical straight line downward.

BA parabolic arc with initial velocity tangent to the bob's circular path at the moment of breaking.

CA parabolic arc starting from rest, curving toward the direction of

\vec E

DA straight line tilted from the vertical toward

\vec E

by angle

\arctan\dfrac{mg}{qE}

EA straight line tilted from the vertical toward

\vec E

by angle

\arctan\dfrac{qE}{mg}

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