1. If two conducting sphere are connected after charging separately then ?

Electrostatic energy energy and charge remains conserved

Electrostatic energy sphere energy will remain conserved

Electrostatic energy charges remains conserved

None

Answer: Electrostatic energy charges remains conserved

Explanation:


2. Charge is the property associated with matter due to which it produces and experiences ?

magnetic effects only

both electric and magnetic effects

electric effects only

None of these

Answer: both electric and magnetic effects

Explanation:


3. Quantisation of charge was experimentally demonstrated by ?

Millikan’s oil drop experiment

Davisson and Germer experiment

Frank-Hertz experiment

Einstein’s photoelectric effect

Answer: Millikan’s oil drop experiment

Explanation:


4. Electric lines of force about a negative point charge are ?

radial, outwards

radial, inwards

circular anticlockwise

circular clockwise

Answer: radial, inwards

Explanation:


5. Gauss's law is valid for ?

only irregular open surfaces

any open surface

any closed surface

only regular close surfaces

Answer: any closed surface

Explanation:


6. In non-uniform electric field, electric dipole experiences ?

force only

None of these

torque only

torque as well as net force

Answer: torque as well as net force

Explanation:


7. The surface considered for Gauss’s law is called ?

Plane surface

Gaussian surface

Closed surface

Spherical surface

Answer: Gaussian surface

Explanation:


8. A point charge +q is placed at a distance d from an isolated conducting plane. The field at a point P on the other side of the plane is ?

directed radially towards the point charge.

directed radially away from the point charge.

directed perpendicular to the plane and away from the plane.

directed perpendicular to the plane but towards the plane.

Answer: directed perpendicular to the plane and away from the plane.

Explanation:

The electric field lines are away from positive charge and perpendicular to the surface. Hence the field at a point P on the other side of the plane is directed perpendicular to the plane and away from the plane.


9. The unit of electric dipole moment is ?

farad

coulomb-meter

newton

coulomb

Answer: coulomb-meter

Explanation:

The electric dipole moment is a measure of the separation of positive and negative electrical charges within a system, that is, a measure of the system's overall polarity. The SI unit for electric dipole moment is the coulomb-meter (C?m).


10. A soap bubble is given a negative charge, then its radius ?

decreases

may increase or decrease

remains unchanged

increases

Answer: increases

Explanation: