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Figure shows three circular arcs, each of radius R and total charge as indicated. The net electric potential at the centre of curvature is:
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Important Questions on Electrostatics

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Practice Book for KVPY Aptitude Test - Stream SA Physics>Chapter 13 - Electrostatics>Exercise 1>Q 4
An electric field is given by Ex=-2x3 kN C-1. The potential of the point 1 m,-2 m, if the potential of the point 2 m, 4 m is taken as zero, is
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Practice Book for KVPY Aptitude Test - Stream SA Physics>Chapter 13 - Electrostatics>Exercise 1>Q 5
Two concentric uniformly charged spheres of radius 10 cm and 20 cm are arranged as shown in the figure. The potential difference between the spheres is:
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Practice Book for KVPY Aptitude Test - Stream SA Physics>Chapter 13 - Electrostatics>Exercise 1>Q 6
A dipole of dipole moment p is kept at the centre of a ring of radius R and charge Q. The dipole moment has direction along the axis of the ring. The resultant force on the ring due to the dipole is:
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Practice Book for KVPY Aptitude Test - Stream SA Physics>Chapter 13 - Electrostatics>Exercise 1>Q 7
In the figure two conducting concentric spherical shells are shown. If the electric potential at the centre is 20 V and  the electric potential of the outer shell is 5 V, then the potential of the inner shell is:
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Practice Book for KVPY Aptitude Test - Stream SA Physics>Chapter 13 - Electrostatics>Exercise 1>Q 8

The figure shows a charge q placed inside a cavity in an uncharged conductor. Now if an external electric field is switched on

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Practice Book for KVPY Aptitude Test - Stream SA Physics>Chapter 13 - Electrostatics>Exercise 1>Q 9
Two infinitely large charged planes having uniform surface charge density +σ and -σ are placed along x-y plane and yz plane, respectively as shown in the figure. Then the nature of electric lines of forces in x-z plane is given by
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Practice Book for KVPY Aptitude Test - Stream SA Physics>Chapter 13 - Electrostatics>Exercise 1>Q 10
On moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is
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Practice Book for KVPY Aptitude Test - Stream SA Physics>Chapter 13 - Electrostatics>Exercise 1>Q 11
A charged particle q is placed at the centre O of cube of length L ABCDEFGH. Another same charge q is placed at a distance L from O. Then the electric flux through BCFG is
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