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Two point charges A and B of +5 nC and +...

Two point charges A and B of +5 nC and +3 nC are kept at 6 cm apart in air medium.
The work required to move charge B towards charge A through 1 cm is :

A

A.3.5 x10^(-7) J`

B

B.4.5 xx 10^(-7)J`

C

C.4.5 xx 10^(-11)J`

D

D.3.5 xx 10^(-10)J`

Text Solution

Verified by Experts

The correct Answer is:
B
work = change in P.E
`V_f - V_i`
`(q_1q_2)/(4piepsilon_0)[1/r_2- 1/r_1]`
`=9xx10^9xx5xx10^-9xx3xx10^-9xx[1/(5xx10^-2)-1/(6xx10^-2)]`
`=135xx10^-9xx10^2xx1/30`
`=4.5xx10^-7J`
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