Question

Find the work done when a point charge of 2.0 micro coulomb is moved from
a point at a potential of -10V to point at which the potential is zero?

Answer 1

$\huge{\underline{\underline{\boxed{\sf{\green{Answer :- }}}}}}$

Work done = qΔ V - - - - - - - - (1)Potential difference between A and O, V1 = e × r V1 = kqr = k × 20 × 10^-60.05 V1

= 0.0004k V Potential difference potential difference between B and O

Potential difference between B and OV 2 = rkq

= 0.15k×20×10 −6

V 1 =0.00013kV

Work done in bringing an electron from A

Work done in bringing an electron from O to B

W net = W 1 +W 2

= q(V 1 +V 2)

=9×10 9×1.6×10 −19

(0.00053)W net

=7.632×10−13 J

Here k= 9×10 9

Answer 2

Answer:

Work done = qΔ V - - - - - - - - (1)Potential difference between A and O, V1 = e × r V1 = kqr = k × 20 × 10^-60.05 V1

= 0.0004k V Potential difference potential difference between B and O

Potential difference between B and OV 2 = rkq

= 0.15k×20×10 −6

V 1 =0.00013kV

Work done in bringing an electron from A

Work done in bringing an electron from O to B

W net = W 1 +W 2

= q(V 1 +V 2)

=9×10 9×1.6×10 −19

(0.00053)W net

=7.632×10−13 J

Here k= 9×10 9