EASY
JEE Main
IMPORTANT
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As shown in the figure, in steady state, the charge stored in the capacitor is _____×10-6 C.

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Important Questions on Electrostatics

HARD
JEE Main
IMPORTANT
A parallel plate capacitor with width 4 cm, length 8 cm and separation between the plates of 4 mm is connected to a battery of 20 V. A dielectric slab of dielectric constant 5 having length 1 cm, width 4 cm and thickness 4 mm is inserted between the plates of parallel plate capacitor. The electrostatic energy of this system will be _____ ϵ0 J. (Where ϵ0 is the permittivity of free space)
MEDIUM
JEE Main
IMPORTANT
Two capacitors, each having capacitance 40μF are connected in series. The space between one of the capacitors is filled with dielectric material of dielectric constant K such that the equivalence capacitance of the system became 24μF. The value of K will be :
EASY
JEE Main
IMPORTANT
Two electric dipoles of dipole moments 1.2×10-30 cm and 2.4×10-30 cm are placed in two difference uniform electric fields of strengths 5×104 N C-1 and 15×104 N C-1 respectively. The ratio of maximum torque experienced by the electric dipoles will be 1x. The value of x is _____ .
HARD
JEE Main
IMPORTANT
A slab of dielectric constant K has the same cross-sectional area as the plates of a parallel plate capacitor and thickness 34d, where d is the separation of the plates. The capacitance of the capacitor when the slab is inserted between the plates will be :
(Given C0= Capacitance of capacitor with air as medium between plates.)
HARD
JEE Main
IMPORTANT

A uniform electric field E=8mcV m-1 is created between two parallel plates of length 1 m as shown in figure, (where m= mass of electron and e= charge of electron). An electron enters the field symmetrically between the plates with a speed of 2 m s-1. The angle of the deviation θ of the path of the electron as it comes out of the field will be _____ .

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MEDIUM
JEE Main
IMPORTANT

A spherically symmetric charge distribution is considered with charge density varying as

ρr=ρ034rR for rR Zero  for r>R

 

Where, rr<R is the distance from the centre O (as shown in figure). The electric field at point P will be :

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EASY
JEE Main
IMPORTANT

Given below are two statements.
Statement I : Electric potential is constant within and at the surface of each conductor.

Statement II : Electric field just outside a charged conductor is perpendicular to the surface of the conductor at every point.

In the light of the above statements, choose the most appropriate answer from the options give below.

HARD
JEE Main
IMPORTANT
Two identical metallic spheres A and B when placed at certain distance in air repel each other with a force of F. Another identical uncharged sphere C is first placed in contact with A and then in contact with B and finally placed at midpoint between spheres Aand B. The force experienced by sphere C will be :