Q. No.Two spherical conductors and having equal radii and carrying equal charges in them repel each other with a force when kept apart at some distance. A third spherical conductor having same radius as that of but uncharged is brought in contact with , then brought in contact with and finally removed away from both. The new force of repulsion between and is:
1.
2.
3.
4.
1.
2.
3.
4.
Two equally charged, identical metal spheres A and B repel each other with a force 'F'. The spheres are kept fixed with a distance 'r' between them. A third identical, but uncharged sphere C is brought in contact with A and then placed at the mid-point of the line joining A and B. The magnitude of the net electric force on C is
(1) F
(2) 3F/4
(3) F/2
(4) F/4
| 1. | 2. | ||
| 3. | 4. |
A charge q is placed at the centre of the line joining two equal charges Q. The system of the three charges will be in equilibrium, if q is equal to
(1)
(2)
(3)
(4)
The figure shows the electric lines of force emerging from a charged body. If the electric fields at A and B are EA and EB respectively and if the distance between A and B is r, then:
1.
2.
3.
4.
is an equilateral triangle. Charges are placed at each corner. The electric intensity at will be:
| 1. | 2. | ||
| 3. | zero | 4. |
The magnitude of electric field intensity E is such that, an electron placed in it would experience an electrical force equal to its weight is given by
(1) mge
(2)
(3)
(4)
| 1. | Always along a line of force |
| 2. | Along a line of force, if its initial velocity is zero |
| 3. | Along a line of force, if it has some initial velocity in the direction of an acute angle with the line of force |
| 4. | None of the above |
An uncharged sphere of metal is placed in between two charged plates as shown. The lines of force look like
(1) A
(2) B
(3) C
(4) D
| 1. | and is parallel to the surface |
| 2. | and is parallel to the surface |
| 3. | and is normal to the surface |
| 4. | and is normal to the surface |
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