Electrostatics Quiz 2 – Punjab Meritorious School Preparation Portal

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A hollow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre

decreases as r increases for r R

zero as r increases for r R

increases as r increases for r R

zero as r increases for r R

Polar molecules are the molecules

having a permanent electric dipole moment

having zero dipole moment

acquire a dipole moment only in the presence of electric field due displacement of charges

acquire a dipole moment only when magnetic field is absent

Two parallel infinite line charges with linear charge densities + λ C/m and – λ C/m are placed at a distance of 2R in free space. What is the electric field midway between the two line charges ?

An electric dipole of moment 'p' is placed in an electric field of intensity 'E'. The dipole acquires a position such that the axis of the dipole makes an angle θ with the direction of the field. Assuming that the potential energy of the dipole to be zero when = 90° degrees the torque and the potential energy of the dipole will respectively be:

pE sin θ, - p E cos θ

pE sin θ, - 2pE cos θ

pE sin θ, 2pE cos θ

pE cos θ, - pE cos θ

When air is replaced by a dielectric medium of constant K, the maximum force of attraction between two charges separated by a distance

2m/s, 4m/s

1m/s, 3m/s

1.5m/s, 3m/s

1m/s, 3.5m/s

An electric dipole of dipole moment p is aligned parallel to a uniform electric field E. The energy required to rotate the dipole by 90° is

Point charges + 4q, - q and 4q are kept on the X-axis at point x = 0. x = a and x = 2a respectively. Then

only -q is in stable equilibrium

all the charges are in stable equilibrium

all of the charges are in unstable equilibrium

none of the charges is in equilibrium.

An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is

smaller

5 times greater

10 times greater

equal

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