Question

21. Electric potentials at points P and Q are + 5 V and -2 V. How much work will be
done to displace + 3 C charge to displace it from Q to P?​

Answer 1

Work done = (change in potential) *q

= ( 5-(-2))*3

= 21J

Answer 2

Answer:

For the point having potential difference of +5v,

V=5v

q= 3c

we know that potential difference= work done/charge

i.e V = w/q

= w1 = (5×3) joule

= 15 joule

For the point having potential difference of -2v

V= w/q

w2= - 6joules

Net work done = (-6-15 ) joules

-21 joules

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