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.
An electric flux & passes normally through a spherical Gaussian surface due to a point charge placed at the centre.If the radius of the Gaussion surface is doubled how much flux would pass through the surface?
∅
2?
4?
?/2
Direction of electric field lines due to a positive charge will be
Radially inwards
Radially outwards
Parabolic
Hyperbolic
Unit of flux is
Nm2c2
Nm2c-2
Nm2c-1
Nm-2c2
A certain charge is divided in the ratio m:n so that when we kept at a given distance,the force is maximum.The ratio m:n is
2:1
4:1
1:1
3:1
An infinite number of electric charge each of magnitude +ve are arranged along the x axis at a distance x=1m,x=2m,x=4m,x=8m..........etc The electric field at the origin will be
1/2πεo
e/3πεo
e/5πεo
e/6πεo
The value of electric charge on any object cannot be less than
4.9*10-19 c
Ic
3.2*10-19c
1.6*10-19c
A simple pendulum having a bob of mass m carries a charge q when the bob is kept in a uniform electric field E is the horizontal direction the inclination of the string vertical is
Cos-1(qE/mg)
tan-1(qE/mg)
sin-1(qE/mg)
cot-1(qE/mg)
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
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
