REVISION TOPIC 1,2,3

1. According to the Coulomb’s law, the electrostatic force between two point charges is directly proportional to the

• sum of charges
• product of the magnitude of charges
• their separation distance
• square of their separation distance

2. An attractive force exists between

• two neutral charges
• a negative charge and a neutral charge
• a negative charge and a positive charge
• two positive charges

3. The electric field strength at a point is the

• work done to bring a proton from infinity to the point
• electric potential energy to bring a unit of positive test charge from infinity to the point
• electric potential of charge per unit square of distance at the point
• electrostatic force that acts on a unit of positive test charge at the point

4. The electric field lines point towards

• a positive charge
• a negative charge
• a positive plate
• zero potential point

5. The unit of electric potential is

• coulomb
• volt
• newton
• ohm

6. The electric potential at all points on an equipotential surface of a positively charged sphere is

• not the same
• the same
• infinity
• zero

7. Which of the following statements is CORRECT to define a capacitor?

• A device that is capable of storing electric charges or electric potential energy
• The ratio of the charge on either plate to the electric field strength between them
• The ratio of the charge on either plate to the potential difference between them
• The ratio between the potential difference between the plates and the charge on either plate

8. Farad is the unit of

• resistance
• time constant
• charge
• capacitance

9. Which of the following equations is CORRECT to represent energy stored in a capacitor?

• 
• 
• 
• 

10. The quantity RC that appears in the exponent for all equations in the charging and discharging process refers to the

• rest time
• time constant
• time required for the charge on the capacitor decreases to zero
• time for the capacitor to fully charged