Practice question
Question
A point charge Q = 8 × 10⁻⁹C is placed at the origin. Calculate the potential at a point 4 m away from the charge. (Take 1/4 π ε_0 = 9 × 10⁹Nm² C^{-2 ).
Explanation
Given:
A point charge Q = 8 × 10⁻⁹C is placed at the origin. Calculate the potential at a point 4 m away from the charge. (Take 1/4 π ε_0 = 9 × 10⁹Nm² C^{-2 ).
Formula:
Potential due to a point charge: V = 1/4 π ε_0 Q/r.
Substitution & Calculation:
Substitute: V = 9 × 10⁹ × frac8 × 10⁻⁹⁴= 9 × 10⁹ × 2 × 10⁻⁹= 18 V .
Final Result:
The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.
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