Two parallel infinite line charges with linear charge densities are placed at a distance R. Electric field mid-way between the two line charges is-
1.
2. zero
3.
4.
1. 3E along KO
2. E along OK
3. E along KO
4. 3 E along OK
Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is r. Now the strings are rigidly clamped at half the height. The equilibrium separation between the balls now become:
1.
2.
3.
4. None of the above
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A sphere encloses an electric dipole with charges . What is the total electric flux through the sphere?
(1) -3
(2) zero
(3) 3
(4) 6
An electric dipole is placed at an angle of 30 ° with an electric field intensity 2 x 105 N/C. It experiences a torque equal to 4 Nm. The charge on the dipole, if the dipole length is 2 cm, is
1. 8mC
2. 2mC
3. 5mC
4.
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A square surface of side L m is in the plane of the paper. A uniform electric field (V/m), also in the plane of the paper, is limited only to the lower half of the square surface, (see figure). The electric flux in SI units associated with the surface is :
1.
2.
3. zero
4.
A hollow cylinder has a charge q coulomb within it(at the geometrical centre). If ϕ is the electric flux in unit of voltmeter associated with the curved surface B, the flux linked with the plane surface A in unit of voltmeter will be:
1.
2.
3.
4.
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A square surface of side L metre in the plane of the paper is placed in a uniform electric field E (volt/m) acting along the same place at an angle θ with the horizontal side of the square as shown in figure. The electric flux linked to the surface in unit of V-m, is
1.
2.
3.
4. 0
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An electron falls from rest through a vertical distance h in a uniform and vertically upward-directed electric field E. The direction of the electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in through the same vertical distance h. The time fall of the electron, in comparison to the time fall of the proton is :-
1. smaller
2. 5 times greater
3. 10 times greater
4. equal
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