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 small spheres each having the charge +Q are suspended by insulating threads of length L from a hook. If this arrangement is taken in space where there is no gravitational effect, then the angle between the two suspensions and the tension in each will be:
1.
2.
3.
4.
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 dielectric constant of pure water is 81. Its permittivity will be:
1. 7.12 × 10–10 MKS units
2. 8.86 × 10–12 MKS units
3. 1.02 × 1013 MKS units
4. Cannot be calculated
Force of attraction between two point charges Q and – Q separated by d meter is Fe. When these charges are given to two identical spheres of radius R = 0.3 d whose centres are d meter apart, the force of attraction between them is
1. Greater than Fe
2. Equal to Fe
3. Less than Fe
4. None of the above
One metallic sphere A is given a positive charge whereas another identical metallic sphere B of the exact same mass as of A is given an equal amount of negative charge. Then:
(1) mass of A and mass of B are the same.
(2) mass of A is more.
(3) mass of B is less.
(4) mass of B is more.
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 |
When \(10^{19}\) electrons are removed from a neutral metal plate, the electric charge on it is?
1. | \(-1.6\) C | 2. | \(+1.6\) C |
3. | \(10^{19}\) C | 4. | \(10^{-19}\) C |
Two charges each equal to 2μC are 0.5m apart. If both of them exist inside the vacuum, then the force between them is
(1) 1.89 N
(2) 2.44 N
(3) 0.144 N
(4) 3.144 N