We can charge a metal sphere positively without touching it by:

1. Conduction

2. Induction

3. Friction

4. Both (1) and (2)

Subtopic:  Electric Charge |
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If 109 electrons move out of a body to another body every second, how much time approximately is required to get a total charge of 1 C on the other body?

1. 200 years

2. 100 years

3. 150 years

4. 250 years

Subtopic:  Electric Charge |
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The amount of positive and negative charges in a cup of water (250 g) are respectively:

Subtopic:  Electric Charge |
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The ratio of the magnitude of electric force to the magnitude of gravitational force for an electron and a proton will be:

Subtopic:  Coulomb's Law |
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A charged metallic sphere A is suspended by a nylon thread. Another identical charged metallic sphere B held by an insulating handle is brought close to A such that the distance between their centres is 10 cm, as shown in Fig.(a). The resulting repulsion of A is noted. Then spheres A and B are touched by identical uncharged spheres C and D respectively, as shown in Fig.(b). C and D are then removed and B is brought closer to A to a distance of 5.0 cm between their centres, as shown in Fig. (c). What is the expected repulsion on A on the basis of Coulomb’s law?

1. Electrostatic force on A due to B remains unaltered.

2. Electrostatic force on A due to B becomes double.

3. Electrostatic force on A due to B becomes half.

4. Can't say.

Subtopic:  Coulomb's Law |
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Consider three charges  each equal to q at the vertices of an equilateral triangle of side l. What is the force on a charge Q (with the same sign as q) placed at the centroid of the triangle, as shown in the figure?

Subtopic:  Coulomb's Law |
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Consider the charges qq, and –q placed at the vertices of an equilateral triangle, as shown in the figure. Then the sum of the forces on the three charges is:

Subtopic:  Coulomb's Law |
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An electron falls through a distance of 1.5 cm in a uniform electric field of magnitude  [figure (a)]. The direction of the field is reversed keeping its magnitude unchanged and a proton falls through the same distance [figure (b)]. If  are the time of fall for electron and proton respectively, then:

2. te>tp
3. te<tp
4. None of these

Subtopic:  Electric Field |
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Two-point charges ${q}_{1}$ and ${q}_{2}$, of magnitude   and , respectively, are placed 0.1 m apart. The electric field at point  A (as shown in the figure) is:

Subtopic:  Electric Field |
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Two charges ±10 µC are placed 5.0 mm apart. The electric field at a point P on the axis of the dipole 15 cm away from its centre O on the side of the positive charge, as shown in the figure is:

Subtopic:  Electric Dipole |
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