Electrostatics Test

Result

Electrostatics Test - 51

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Weekly Quiz Competition

Question 1
4 / -1

The value (in vacuum) of energy density at a place in a region of electric field intensity E, due to it, is given by

A

B

C

D
Question 2
4 / -1

Two conducting spheres of radii 3 cm and 1 cm are separated by a distance of 10 cm in free space. If the spheres are charged to same potential of 10 V each, the force of repulsion between them is

A

B

C

D

Solution
Question 3
4 / -1

The electric field created by a point charge falls with distance r from the point charge as

A

B

C

D

Solution
Question 4
4 / -1

Two large vertical and parallel metal plates having a separation of 1 cm are connected to a D.C. voltage source of potential difference X. A proton is released at rest midway between the two plates. It is found to move at 45° to the vertical just after release. Then, X is nearly

A
1 × 10^–5 V

B
1 × 10^–7 V

C
1 × 10^–9 V

D
1 × 10^–10 V

Solution
Question 5
4 / -1

An electric dipole when placed in a uniform electric field E will have minimum potential energy, if the positive direction of dipole moments makes the following angle with E

A
π

B
π /2

C
Zero

D
3 π /2

Solution
Question 6
4 / -1

A given charge is situated at a certain distance from an electric dipole in the end-on position experiences a force F. It the distance of the charge is doubled, the force acting on the charge will be

A
2F

B
F/2

C
F/4

D
F/8

Solution
Question 7
4 / -1

A
pE cos θ

B
pE sin θ

C
pE (1– cos θ)

D
–pE cos θ

Solution
Question 8
4 / -1

Two equal and opposite charge (+q and – q) are situated at x distance from each other, the value of potential at very far point will depend upon

A
Only on q

B
Only on x

C
On qx

D
On q/x
Question 9
4 / -1

The ratio of electric field and potential (E/V) at midpoint of electric dipole, for which separation is l

A

B

C

D
None of these

Solution
Question 10
4 / -1

An electric dipole has a pair of equal and opposite point charges q and –q separated by a distance 2x. The axis of the dipole is defined as

A
Direction from positive charge to negative charge

B
Direction from negative charge to positive charge

C
Perpendicular to the line joining the two charges drawn at the centre and pointing upward direction

D
Perpendicular to the line joining the two charges drawn at the centre and pointing downward direction