Understanding Electric Charges and Forces

What is the SI unit of electric charge?

• Volt

• Ampere

• Coulomb

• Ohm

Which of the following is true about electric charges?

• Like charges attract

• Unlike charges repel

• Like charges repel

• Charges have no effect on each other

The force between two point charges is 10 N. If the distance between them is doubled, what will be the new force?

• 5 N

• 2.5 N

• 20 N

• 40 N

What is the charge of an electron?

Coulomb's law states that the force between two point charges is:

• Directly proportional to the product of the charges

• Inversely proportional to the distance between them

• Directly proportional to the distance between them

• Both a and b

What happens to the electric field strength as you move away from a point charge?

• It increases

• It decreases

• It remains constant

• It oscillates

The principle of conservation of charge states that:

• Charge can be created or destroyed

• The total charge in an isolated system remains constant

• Charge always flows from positive to negative

• Charge is always quantized

Which of the following materials is the best conductor of electricity?

• Rubber

• Glass

• Copper

• Wood

What is the electric field strength at a distance of 2 m from a point charge of 4 C?

Which of the following is NOT a method of charging an object?

• Friction

• Conduction

• Induction

• Radiation