Physics Basic Unit#6 Test

A charge conductor has charge on its

• Outside surface

• Middle point

• Surrounding

• Inner surface

J of work is to be done against an existing electric field to take a charge of 0.01 C from A to B. Find the potential difference between B and A.

• 120 V

• 1.2 V

• 1200 V

• 12 V

A charge of 100C has a potential at a distance of 9 m equal to:

• 10⁶ V

• 10⁵ V

• 10^-5 V

• 10^-6 V

The electric intensity at infinite distance from the point charge is

• zero

• infinite

• 1 volt m^-1

• negative

The value of K depends upon

• Quantity of charges

• Nature of medium between the charges

• Both A and B

• None of these

What is the value of the potential gradient at a point in an electric field?

• The electrical potential energy of a unit positive charge at that point

• The electric field strength at that point

• The force acting on a unit negative charge at that point

• The work done to move unit negative charge from infinity to that point

The electric field due to a charge at a distance of 3 m from it is 500 N/Coulomb. The magnitude of the charge is

• 2.5μC

• 2.0μC

• 1.0μC

• 0.5μC

Force between two similar unit charges placed one meter a part in air is:

• one newton

• 9 × 10⁹ N

• 9 × 10^–9 N

• zero newton

The electrostatic force between two charges is 40 N. If we place dielectric of ε_r = 2 between the charges, then the force becomes equal to:

• 42 N

• 88.2 N

• 20 N

• 2 N

When a solid body is negatively charged by friction , it means that the body has

• Acquired excess of electrons

• Acquired some electron and lost a lesser number of protons

• Lost some protons

• Lost some positive ions