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Q. No.Four charges \(q,q\) and \(-q,-q\) are placed at the four vertices of a square of side \(a,\) with like charges across a diagonal. The potential at the centre of the square is:
1. zero
2. \(\sqrt2\frac{kq}{a}\)
3. \(2\frac{kq}{a}\)
4. \(4\frac{kq}{a}\)
1. zero
2. \(\sqrt2\frac{kq}{a}\)
3. \(2\frac{kq}{a}\)
4. \(4\frac{kq}{a}\)
Subtopic: Electric Potential |
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Two tiny spheres carrying charges of \(1.5\) µC and \(2.5\) µC are located \(30\) cm apart. What is the potential at a point \(10\) cm from the midpoint in a plane normal to the line and passing through the mid-point?
1. \(1.5\times 10^{5}\) V
2. \(1.0\times 10^{5}\) V
3. \(2.4\times 10^{5}\) V
4. \(2.0\times 10^{5}\) V
Subtopic: Electric Potential |
From NCERT
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A charge is uniformly distributed on the circumference of a disc, and the potential at its centre is \(5\) volt. If the charge was uniformly distributed on the surface of this disc, the potential at a point \(P\) on its axis, at a distance equal to the disc's radius from its centre, equals:
1. \(10\) V
2. \(5 \sqrt 2\) V
3. \(10 \sqrt 2\) V
4. \(10 (\sqrt {2} -1)\) V
1. \(10\) V
2. \(5 \sqrt 2\) V
3. \(10 \sqrt 2\) V
4. \(10 (\sqrt {2} -1)\) V
Subtopic: Electric Potential |
From NCERT
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A negative point charge \((-q)\) is placed at the centre of a spherical ball of charge distributed uniformly over its volume. The radius of the ball is \(R.\) The electric field on its surface is zero. The potential on its surface is:
1. zero
2. \({kq \over 2R}\)
3. \({-kq \over 2R}\)
4. \({2kq \over R}\)
1. zero
2. \({kq \over 2R}\)
3. \({-kq \over 2R}\)
4. \({2kq \over R}\)
Subtopic: Electric Potential |
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