Q. No.Four charges are arranged at the corners of a square ABCD, as shown in the adjoining figure. The force on the charge kept at the centre O is:
| 1. | Zero | 2. | Along the diagonal AC |
| 3. | Along the diagonal BD | 4. | Perpendicular to side AB |
Out of gravitational, electromagnetic, Vander Waals, electrostatic and nuclear forces; which two are able to provide an attractive force between two neutrons
(1) Electrostatic and gravitational
(2) Electrostatic and nuclear
(3) Gravitational and nuclear
(4) Some other forces like Vander Waals
A total charge \(Q\) is broken in two parts \(Q_1\) and \(Q_2\) and they are placed at a distance \(R\) from each other. The maximum force of repulsion between them will occur, when:
| 1. | \(Q_2=\frac{Q}{R}, Q_1=Q-\frac{Q}{R}\) |
| 2. | \(Q_2=\frac{Q}{4}, Q_1=Q-\frac{2 Q}{3}\) |
| 3. | \(Q_2=\frac{Q}{4}, Q_1=\frac{3 Q}{4}\) |
| 4. | \(Q_1=\frac{Q}{2}, Q_2=\frac{Q}{2}\) |
Three charges \(4q,Q,\) and \(q\) are in a straight line in the position of \(0,l/2,\) and \(l\) respectively. The resultant force on \(q\) will be zero if \(Q\) equal to:
1. \(-q\)
2. \(-2q\)
3. \(\frac{-q}{2}\)
4. \(4q\)
Two charges each of 1 coulomb are at a distance 1 km apart, the force between them is
(1) 9 × 103 Newton
(2) 9 × 10–3 Newton
(3) 1.1 × 10–4 Newton
(4) 104 Newton
Two charges \(+2\) C and \(+6\) C are repelling each other with a force of \(12\) N. If each charge is given \(-2\) C of charge, then the value of the force will be:
| 1. | \(4\) N (attractive) | 2. | \(4\) N (repulsive) |
| 3. | \(8\) N (repulsive) | 4. | zero |
The force between two charges 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become:
| 1. | 7.20 N | 2. | 11.25 N |
| 3. | 22.50 N | 4. | 45.00 N |
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
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)
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
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