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Question:

Two points P and Q are maintained at the potentials of 10 V and -4 V, respectively. The work done in moving 100 electrons from P to Q is :

2.24×10-16 J

-2.24×10-16 J

-9.60×10-17 J

9.60×10-17 J

Solution:

W = QΔV = Q(Vq - Vp)
W = 100 × (-1.6 × 10-19) × (-14)
= 2.24 × 10-16J