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Explanation / Answer

Initially potential energy = qV

Kinetic energy = 0

Finally potential energy = 0

Kinetic energy = 0.5 mv2

All potential energy converted into kinetic energy

qV = 0.5 mv2

Velocity v = (qV/0.5m)0.5

=( 1.6*10^-19 x 424 / 0.5 x 9.11*10^-31)0.5

= 1.22 x 10^7 m/s

Part b

Centrifugal force = magnetic force

mv2/r = qVB

r = mv2 /qVB

r = 9.11 x 10^-31 x (1.22 x 10^7)2 / (1.6*10^-19 x 424 x 0.150)

r = 13.33 m

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