Question

Calculate electric potential at a point 1m distance from a point charge of 10–9

coulomb.

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Answer 1

• V = kq/r = 9 x 109 x 10-9/1 = 9 volt

The potential at infinity is chosen to be zero. Thus V for a point charge decreases with distance, whereas E for a point charge decreases with distance squared: E=Fq=kQr2. Recall that the electric potential V is a scalar and has no direction, whereas the electric field E is a vector.

Answer 2

Answer:

Electric potential at the required point will be 9 Volts

Explanation:

Given

Magnitude of a Point charge, Q = 10⁻⁹ C

Distance at which Electric potential is to be found, s = 1 m

To find

Electric potential at a distance 's' from the point charge, V =?

Formula required

Formula for the electric potential 'V' produced by a point charge with a charge of magnitude 'Q', on a point at distance 's' from the point charge.

       

        V = k Q / s

[ Where k is a constant with value; k = 9 × 10⁹ Nm² C⁻²]

Calculation:

Using formula

→ V = k Q / s

→ V = ( 9 × 10⁹ ) × ( 10⁻⁹ ) / 1

→ V = 9 × 10⁹ / 10⁹

→ V = 9 Volts

Therefore,

Electric potential at the required point will be 9 Volts.