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A battery used for charging an air capacitor is removed after the capacitor is fully charged. Some mica sheets (dielectric constant K ) are inserted between the two plates. If E is the energy of the air capacitor, then the energy stored in the mica capacitor will be

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Important Questions on Electrostatics

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JEE Main
IMPORTANT
A positively charged particle is released from rest in an uniform electric field. The electric potential energy of the charge.
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JEE Main
IMPORTANT
A very large sphere having charge Q uniformly distributed on the surface is compressed uniformly till its radius reduces to R. The work done by the electric forces in this process is
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JEE Main
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Four charges are fixed along the y-axis as shown. A positive charge approaches the system along the x-axis with initial speed just enough to cross the origin. Then its total energy at the origin is

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JEE Main
IMPORTANT

The diagram shows the arrangement of three small uniformly charged spheres A, B and C. The arrows indicate the direction of the electrostatic forces acting between the spheres (for example, the left arrow on sphere A indicates the electrostatic force on sphere A due to sphere B). At least two of the spheres are positively charged. Which sphere, if any, could be negatively charged?

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JEE Main
IMPORTANT
A hollow closed conductor of irregular shape is given some charge. Which of the following statements is incorrect?
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JEE Main
IMPORTANT
A cube of side b has a charge q at each of its vertices. The electric field due to this charge distribution at the centre of this cube will be 14πε0 times
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JEE Main
IMPORTANT

Figures below show regular hexagons, with charges at the vertices. In which of the following cases the electric field at the centre is not zero?

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JEE Main
IMPORTANT
For which of the following, the superposition principle does not hold?