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The net charge is given to a solid insulating sphere:

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Important Questions on Electrostatics

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A charge Q is kept at the centre of a conducting sphere of inner radius R1 and outer radius R2. A point charge q is kept at a distance r(>R2) from the centre. If q experiences an electrostatic force of 10 N, then assuming that no other charges are present, the electrostatic force experienced by Q will be:
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Consider a neutral conducting sphere. A positive point charge is placed outside the sphere. Then the net charge on the sphere is :
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Three concentric metallic spherical shells of radii R, 2R, 3R, are given charges Q1, Q2, Q3, respectively. It is found that the surface charge densities on the outer surfaces of the shells are equal. Then, the ratio of the charges given to the shells, Q1:Q2:Q3 is
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A positive point charge q is brought near a neutral metal sphere.
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Two small conductors A and B are given charges q1 and q2 respectively. Now they are placed inside a hollow metallic conductor (C) carrying a charge Q. If all the three conductors A, B and C are connected by conducting wires as shown, the charges on A, B and C will be respectively:

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Some charge is being given to a conductor then its potential is:
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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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Two charged spheres having radii a and b are joined with a wire then the ratio of electric field Ea/Eb on their surface is -