The charge on 500 cc500 cc of water due to protons will be:
1. | 6.0×1027 C6.0×1027 C | 2. | 2.67×107 C2.67×107 C |
3. | 6×1023 C6×1023 C | 4. | 1.67×1023 C1.67×1023 C |
A polythene piece rubbed with wool is found to have a negative charge of 3×10−7 C.3×10−7 C. Transfer of mass from wool to polythene is:
1. 0.7×10−18 kg0.7×10−18 kg
2. 1.7×10−17 kg1.7×10−17 kg
3. 0.7×10−17 kg0.7×10−17 kg
4. 1.7×10−18 kg1.7×10−18 kg
If 109109 electrons move out of a body to another body every second, how much time approximately is required to get a total charge of 11 C on the other body?
1. 200200 years
2. 100100 years
3. 150150 years
4. 250250 years
A total charge QQ is broken in two parts Q1Q1 and Q2Q2 and they are placed at a distance RR from each other. The maximum force of repulsion between them will occur, when:
1. | Q2=QR,Q1=Q−QRQ2=QR,Q1=Q−QR |
2. | Q2=Q4,Q1=Q−2Q3Q2=Q4,Q1=Q−2Q3 |
3. | Q2=Q4,Q1=3Q4Q2=Q4,Q1=3Q4 |
4. | Q1=Q2,Q2=Q2Q1=Q2,Q2=Q2 |
Two charges +2+2 C and +6+6 C are repelling each other with a force of 1212 N. If each charge is given −2−2 C of charge, then the value of the force will be:
1. | 44 N (attractive) | 2. | 44 N (repulsive) |
3. | 88 N (repulsive) | 4. | zero |
1. | 4 cm4 cm from 2 μC.2 μC. |
2. | 2 cm2 cm from 2 μC.2 μC. |
3. | 2 cm2 cm from 8 μC.8 μC. |
4. | 3 cm3 cm from 8 μC.8 μC. |
Two positive ions, each carrying a charge qq, are separated by a distance dd. If FF is the force of repulsion between the ions, the number of electrons missing from each ion will be:
(ee is the charge on an electron)
1. | 4πε0Fd2e24πε0Fd2e2 | 2. | √4πε0Fe2d2√4πε0Fe2d2 |
3. | √4πε0Fd2e2√4πε0Fd2e2 | 4. | 4πε0Fd2q24πε0Fd2q2 |
The acceleration of an electron due to the mutual attraction between the electron and a proton when they are 1.6 ˚A1.6 ˚A apart is:
(14πε0=9×109 Nm2C−2)(14πε0=9×109 Nm2C−2)
1. | 1024 m/s2 | 2 | 1023 m/s2 |
3. | 1022 m/s2 | 4. | 1025 m/s2 |
1. | 4F3 | 2. | F |
3. | 9F16 | 4. | 16F9 |