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Class XII Physics Electrostatics 3

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Question 1

A charge Q is uniformly distributed over the surface of two concentric conducting spheres of radii R and r (R > r) Such that surface charge densities are same for both spheres. Then potential at common centre of these spheres -

Question 2

A hollow spherical conductor of radius R is given a charge Q. Work done in moving a charge q from its centre to surface is -

Question 3

A charge q is placed at the center of the open end of a cylindrical vessel (figure). The flux of the electric field through the surface of the vessel is -

Question 4

A charged water drop of radius r is in equilibrium in an electric field. If charge on it is equal to charge on an electron, then intensity of electric field will be: (density of water = ρ, assume gravity)

Question 5

Four charges q, 2q, – 4q and 2q are placed in order at the four corners of a square of side b. The net field at the centre of the square is –

Question 6

A wire as a parabola y = 4x² is located in a uniform magnetic field of inductance B perpendicular to the xy plane. At t = 0 a connection starts translation wise from the parabola apex with constant acceleration α. The induced emf in the loop, thus formed, as a function of y is

Question 7

If the electric flux entering and leaving an enclosed surface respectively is φ₁ and φ₂, the electric charge inside the surface will be

Question 8

At any point (x, 0, 0) the electric potential V is

volt, then electric field intensity at x = 1 m is -

Question 9

Capacitance (in F) of a spherical conductor having radius 1 m, is:

Question 10

Figure shows a network of capacitors where the numbers indicates capacitances in micro Farad The value of capacitance C if the equivalent capacitance between point A and B is to be 1 μF is:

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