Question

The electric potential at a distance of $3m$ on the axis of a short dipole of dipole moment $4\times {10}^{-12}$ coulomb-metre is

• A. $1.33\times {10}^{-3}V$
• B. $4mV$
• C. $12mV$
• D. $27mV$

Answer 1

Answer: (A)

Step 1: Given

$Distance(r)=3m$

Dipole moment(p) = $4\times {10}^{-12}$

Step 2: Formula used

Electric potential(V) = $\frac{kp}{r^2}$

Step 3: Finding the electric potential(V)

Electric potential(V)=$\frac{9\times {10}^9\times 4\times {10}^{-12}}{3^2}=4\times {10}^{-3}V$

V= 4 mV

Hence, option B(4 mV) is correct.