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Electric Potential and Potential Difference

Four chargers...

Question

Four chargers $q_{1} = - 0.02 μ C$ , $q_{2} = + 0.04 μ C$ , $q_{3} = + 0.02 μ C$ , and $q_{4} = - 0.04 μ C$ are at the four corners of a square of side $9 c m$ . Then the potential at the centre of the square is :

9 V

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3 V

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1.2 V

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Z e r o

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Solution

The correct option is D $Z e r o$
We know potential is a scalar quantity
$∴$ potential at centre $= \frac{k (- 0.02)}{r} + \frac{k (- 0.04)}{r} + \frac{k (0.02)}{r} + \frac{k (0.04)}{r}$
$= 0$

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Four chargers q1=−0.02μC, q2=+0.04μC, q3=+0.02μC, and q4=−0.04μC are at the four corners of a square of side 9cm . Then the potential at the centre of the square is :

The correct option is D ZeroWe know potential is a scalar quantity ∴ potential at centre =k(−0.02)r+k(−0.04)r+k(0.02)r+k(0.04)r=0

Four chargers $q_{1} = - 0.02 μ C$ , $q_{2} = + 0.04 μ C$ , $q_{3} = + 0.02 μ C$ , and $q_{4} = - 0.04 μ C$ are at the four corners of a square of side $9 c m$ . Then the potential at the centre of the square is :

The correct option is D $Z e r o$
We know potential is a scalar quantity
$∴$ potential at centre $= \frac{k (- 0.02)}{r} + \frac{k (- 0.04)}{r} + \frac{k (0.02)}{r} + \frac{k (0.04)}{r}$
$= 0$