The electric potential at point `A` is `20 V` and at `B` is `-40 V`. Find the work done by an external and electrostatic force in moving an electron slowly from B to A.

The electric potential at point `A` is `20 V` and at `B` is `-40 V`. F

1.	The electric potential at point `A` is `20 V` and at `B` is `-40 V`. Find the work done by an external and electrostatic force in moving an electron slowly from B to A.
Answer» Correct Answer - A::B Here, the test charge is an electron, i.e. `q_0=1.6xx10^-19C` `V_A=20V` `and V_B=-40V` work done by external force `(W_(B-A))_("external force" =q_0(V_A-V_B)` `=(-1.6xx10^-19)[(20)-(-40)]` `=-9.6xx10^-18J` work done electric force `(W_(B-A))_("electric force")=-(W_(B-A))_("external force")` `=-(-9.6xx10^-18J)` `=9.6xx10^-18J`

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The electric potential at point `A` is `20 V` and at `B` is `-40 V`. Find the work done by an external and electrostatic force in moving an electron slowly from B to A.

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