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Questions  

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

a
3.2×10−10 J
b
3.2×10−18 J
c
1 N
d
1 dyne

detailed solution

Correct option is B

K.E. =q0(VA−VB)=1.6×10−19(70−50)=3.2×10−18J

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