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Calculate the electric potential at a distance of 20.0cm from a point charge of 0.015C...

Physics
WAEC 1995

Calculate the electric potential at a distance of 20.0cm from a point charge of 0.015C placed in air of permittivity (Take \(\frac{1}{4πεo}\) as 9.0 x 10\(^9\) Nm\(^2\)C\(^2\))

  • A. 3.40x106V
  • B. 6.75x108V
  • C. 6.75x1012V
  • D. 3.40x105V
  • E. 8.30 x 102V
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Correct Answer: Option B
Explanation

To calculate the electric potential \( V \) at a distance \( r \) from a point charge \( Q \):

Given: \( Q = 0.015 \, \text{C} \),  \( r = 0.20 \, \text{m} \)

\( \frac{1}{4\pi \varepsilon_0} = 9.0 \times 10^9 \, \text{N m}^2/\text{C}^2 \)

The electric potential is given by:

\(V = \frac{1}{4\pi \varepsilon_0} \cdot \frac{Q}{r} = 9.0 \times 10^9 \cdot \frac{0.015}{0.20} = 6.75 \times 10^8 \, \text{V}\)

Thus, the electric potential is: \(6.75 \times 10^8 \, \text{V}\)


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