The electric field at a certain point is 10NC-1.The electric lines of force crossing unit area around the point at right angles to it is
εo
1/εo
10
10/εo
A rectangular coil of area 200cm2 is placed in an electric field 200k^ in Y.Z plane.The electric flux through the coil will be
zero
4*104
40
4
A rod of insulating material is given a positive charge by rubbing it with a piece of fabric and the fabric is then tested for electric charges.The fabric is repeated to have
A positive charge equal to that of the rod.
Negative charge equal to that on the rod.
A positive charge less than that on the rod.
A negative charge greater than that of the rod.
The radius of hydrogen atom is 5*10-11 m and the charge on electron or proton is of magnitude 1.6*10-11 c. At ground state,the dipole moment of the atom is
8*10-30cm
16*10-30cm
0 cm
4*10-30cm
When the distance between two charges becomes half the force between them will be
2 times
half
4 times
8 times
An electric field can deflect
x rays
∝perticles
neutronsq
ϒ rays
Two charged bodies carrying +Q and -Q charges are attached one at each end to a spring of released length L and spring constant K.If the subsequent length of the spring is L then the condition for equilibrium is
Q2=4πεok(L'-L)L2
Q2=4πεok(L'-L)L
Q2=4πεok(L'-L)L'2
Q2=4πεok(L-L')L'2
Two charges exert a force F when kept at distance r between them is air.The distance at which they exert same force in a medium of relative permittivity 4 is
r/4
r/2
4r
2r
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.
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.