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The equation of an equipotential line in an electric field is y=2x, then the electric field strength vector at 1,2 may be :

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Important Questions on Electrostatics

MEDIUM
JEE Main/Advance
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In a certain region of space, the potential is given by V=k2x2-y2+z2. The electric field at the point 1,1,1 has magnitude :
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Three equal charges are placed at the corners of an equilateral triangle. Which of the graphs below correctly depicts the equally-spaced equipotential surfaces in the plane of the triangle? (All graphs have the same scale.)

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A non-conducting ring of radius 0.5 m carries total charge of 1.11×10-10 C distributed non-uniformly on its circumference producing an electric field everywhere in space.
The value of the line integral l=l=0-E·dl 

l=0 being centre of the ring) in volt is

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JEE Main/Advance
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A sphere of radius R and charge Q is placed inside an imaginary sphere of radius 2R whose centre coincides with the given sphere. The flux related to imaginary sphere is:
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JEE Main/Advance
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Electric flux through a surface of area 100 m2 lying in the xy plane is (in V-m ) if E=i^+2j^+3k^:
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JEE Main/Advance
IMPORTANT
A solid metallic sphere has a charge + 3Q. Concentric with this sphere is a conducting spherical shell having charge - Q. The radius of the sphere is 'a' and that of the spherical shell is 'b' b>a. What is the electric field at a distance R a<R<b from the centre?
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A solid conducting sphere having a charge Q is surrounded by an uncharged concentric conducting hollow spherical shell. Let the potential difference between the surface of the solid sphere and that of the outer of hollow shell be V. If the shell is now given a charge of -3Q, the new potential difference between the same two surface is,
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A cube of metal is given a charge +Q; which of the following statements is true?