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Q.

If an electron moves from rest from a point at which potential is 50 V to another point at which potential is 70 V, then its kinetic energy in the final state will be

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a

3.2×10-18 J

b

1 dyne

c

1 N

d

3.2×10-10 J

answer is B.

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Detailed Solution

Kinetic energy,

     =eVA-VB=1.6×10-19(70-50)=3.2×10-18J

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If an electron moves from rest from a point at which potential is 50 V to another point at which potential is 70 V, then its kinetic energy in the final state will be