Electrostatics Test

Result

Electrostatics Test - 159

Score
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Weekly Quiz Competition

Question 1
4 / -1

Two electric charges 12c and –6c are placed 20cm apart in air. There will be a point P on the line joining these charges and outside the region between them, at which the electric potential is zero. The distance of P from –6c charge is ........

A
0.20 m

B
0.10 m

C
0.25 m

D
0.15 m

Solution
Question 2
4 / -1

A
5.5 J

B
2.8 J

C
3.5 J

D
4.5 J
Question 3
4 / -1

4 Points charges each +q is placed on the circumference of a circle of diameter 2d in such a way that they form a square. The potential at the centre is ......

A
0

B

C

D
Question 4
4 / -1

Three identical charges each of 2c are placed at the vertices of a triangle ABC as shown in the figure. If AB + AC = 12 cm and AB . AC = 32cm², the potential energy of the charge at A is .....

A
1.53 J

B
5.31 J

C
1.35 J

D
3.15 J

Solution
Question 5
4 / -1

A ball of mass 1 gm and charge 10^–8 c moves from a point A, where the potential is 600 volt to the point B where the potential is zero. Velocity of the ball of the point B is 20cm/s. The velocity of the ball at the point A will be .....

A

B

C

D

Solution
Question 6
4 / -1

Three charges Q, +q and +q are placed at the vertices of an equilateral triangle of side l as shown in the figure. It the net electrostatic energy of the system is zero, then Q is equal

A

B

C
Zero

D

Solution
Question 7
4 / -1

A

B

C
7

D

Solution
Question 8
4 / -1

A small conducting sphere of radius r is lying concentrically inside a bigger hollow conducting sphere of radius R. The bigger and smaller sphere are charged with Q and q (Q > q) and are insulated from each other. The potential difference between the spheres will be ......

A

B

C

D
Question 9
4 / -1

If 3 charges are placed at the vertices of equilateral triangle of charge ‘q’ each. What is the net potential energy, if the side of equilateral triangle is l cm.

A

B

C

D

Solution
Question 10
4 / -1

If identical charges (–q) are placed at each corner of a cube of side b, then electric potential energy of charge (+q) which is placed at centre of the cube will be .....

A

B

C

D

Solution