when a body is negatively charged by electrostatic conduction its mass will
Slightly increases
Slightly decreases
remains the same
increase or decrease depending on material.
For what purpose Gold leaf electroscope is used?
To find the electric field
To find the electric potential
To detect the charge on a body
To find the force between charges.
Two particles of masses m and 2m with charges q and are placed in a uniform electric field E and allowed to move for the same time.The ratio of their kinetic energies will be
2:1
1:2
4:1
1:4
With the discovery of quarks the basic unit of charge would be
(1/3)e
1e
(1/2)e
(2/3)e
Two charges q1 and q2 are seperated by a distance d in air.A dielectric slab of thickness t of relative permittivity k is introduced between them.The force between the two charges is nearly given by
1/4πεo q1q2/(d-t)2
1/4πεo q1q2/(d-t+t/k)2
1/4πεo q1q2/(d-t+t√k)2
1/4πεo q1q2/(d+kt)2
A given charge situated at a certain distance from on electric dipole in the end on position experiences a force F.If the distance of the charge is doubled the force will be
2F
F/2
F/4
F/8
What happens when two glass rods rubbed with silk and a plastic rod rubbed with fur are brought close to each other?
Repel
Attract
Neither attracted nor repelled
Electrified
Two spherical conductors B and c of equal radii and carrying equal charge on them repel each other with a force F when kept apart at some distance.A third spherical conductor having some redius as that of B but uncharged is brought in contact with B and then with C and removed away from both.The new force of repulsion between B and C
3F/4
3F/8
Which is not true for electric lines of force
All lines originate from positive charge and terminate in negative charge.
Lines of force pass through every point in electric field.
Lines of force intersect each other.
Lines of force are always normal to a charged conductor.
A charge q is placed at the centre of the line joining two equal charges Q.The system of the three charges will be in equlilibrium if q is equal to
-Q/2
-Q/4
+Q/4
+Q/2
