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

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 (A) −19 ×10−17 J (B) 9.60 ×10−17 J (C) −2.24 ×10−16 J (D) 2.24 ×10−16 J

Tardigrade Admin · Accepted Answer

W = QdV = Q(Vq - Vp) = -100 × (1.6 × 10-19) × (- 4 - 10) =+ 100 × 1.6 × 10-19 × 14 = +2.24 10-16 J.

Q. 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

$- 19 \times 1 0^{- 17} J$

$9.60 \times 1 0^{- 17} J$

$- 2.24 \times 1 0^{- 16} J$

$2.24 \times 1 0^{- 16} J$

$W = Q d V = Q (V_{q} - V_{p}) = - 100 \times (1.6 \times 1 0^{- 19}) \times (- 4 - 10)$
$= + 100 \times 1.6 \times 1 0^{- 19} \times 14 = + 2.241 0^{- 16} J .$

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

−19×10−17J

9.60×10−17J

−2.24×10−16J

2.24×10−16J