Four charges $+ 3 μ C, - 1 μ C, + 5 μ C$ and $- 7 μ C$ are arranged on the circumference of a circle of radius $0.5 m$ . The potential at the centre is :

Z e r o

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18 \times 10^{4} V

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- 18 \times 10^{4} V

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288 \times 10^{3} V

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Solution

The correct option is B $Z e r o$
We know potential is a scalar quantity net V at center is just sum of potential due to individual
$V = \frac{k (3 μ C)}{r} + \frac{k (- 1 μ C)}{r} + \frac{k (5 μ C)}{r} + \frac{k (- 7 μ C)}{r}$

$V = \frac{k}{r} (3 - 1 + 5 - 7)$

$V = 0 v o l t s .$

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Four charges +3μC,−1μC,+5μC and −7μC are arranged on the circumference of a circle of radius 0.5m. The potential at the centre is :

The correct option is B ZeroWe know potential is a scalar quantity net V at center is just sum of potential due to individualV=k(3μC)r+k(−1μC)r+k(5μC)r+k(−7μC)rV=kr(3−1+5−7)V=0 volts.

Four charges $+ 3 μ C, - 1 μ C, + 5 μ C$ and $- 7 μ C$ are arranged on the circumference of a circle of radius $0.5 m$ . The potential at the centre is :

The correct option is B $Z e r o$
We know potential is a scalar quantity net V at center is just sum of potential due to individual
$V = \frac{k (3 μ C)}{r} + \frac{k (- 1 μ C)}{r} + \frac{k (5 μ C)}{r} + \frac{k (- 7 μ C)}{r}$

$V = \frac{k}{r} (3 - 1 + 5 - 7)$

$V = 0 v o l t s .$