KCET · Physics · Electrostatics
A potential at a point A is -3 V and that at another point B is 5 V . What is the work done in carrying a charge of 5 m C from B to A ?
- A -0.04 J
- B -0.4 J
- C -4 J
- D -40 J
Answer & Solution
Correct Answer
(A) -0.04 J
Step-by-step Solution
Detailed explanation
\(\begin{aligned} & \text { Wext }=q \Delta V \\ & =q\left(V_f-V_i\right) \\ & =5 \times 10^{-3}\left(V_A-V_B\right) \\ & =5 \times 10^{-3}(-3-5) \\ & =-8 \times 5 \times 10^{-3} \mathrm{~J} \\ & =-40 \times 10^{-3} \mathrm{~J} \\ & =-0.04 \mathrm{~J}\end{aligned}\)
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