Electrostatics Test

Result

Electrostatics Test - 75

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Weekly Quiz Competition

Question 1
4 / -1

Two point charges +q and –q are held fixed at (– d, 0) and (d, 0) respectively of a (X, Y) co-ordinate system. Then

A
E at all points on the Y-axis is along î

B

C
Dipole moment is 2qd directed along î

D
Work has to be done in bringing a test charge from infinity to the origin

Solution
Question 2
4 / -1

A point charge of 40 stat coulomb is placed 2 cm in front of an earthed metallic plane plate of large size. Then the force attraction on the point charge is

A
100 dynes

B
160 dynes

C
1600 dynes

D
400 dynes

Solution
Question 3
4 / -1

A piece of cloud having area 25 × 10⁶ m² and electric potential of 10⁵ volts. If the height of cloud is 0.75 km, then energy of electric field between earth and cloud will be

A
250 J

B
750 J

C
1225 J

D
1475 J

Solution
Question 4
4 / -1

Two point charges (+Q) and (–2Q) are fixed on the X-axis at positions a and 2a from origin respectively. At what positions on the axis, the resultant electric field is zero

A

B

C

D

Solution
Question 5
4 / -1

Six charges, three positive and three negative of equal magnitude are to be placed at the vertices of a regular hexagon such that the electric field at O is double the electric field when only one positive charge of same magnitude is placed at R. Which of the following arrangements of charges is possible for P, Q R, S, T and U respectively

A
+, –, +, –, –, +

B
+, –, +, –, +, –

C
+, +, –, +, –, –

D
–, +, +, –, +, –
Question 6
4 / -1

A charged particle q is shot towards another charged particle Q which is fixed, with a speed v. It approaches Q upto a closest distance r and then returns. If q were given a speed 2v, the closest distances of approach would be

A
r

B
2r

C
r/2

D
r/4

Solution
Question 7
4 / -1

Four charges equal to –Q are placed at the four corners of a square and a charge q is at its centre. If the system is in equilibrium the value of q is

A

B

C

D

Solution
Question 8
4 / -1

Capacitance of a capacitor made by a thin metal foil is 2 µF. If the foil is filled with paper of thickness 0.15 mm, dielectric constant of paper is 2.5 and width of paper is 400 mm, then length of foil will be

A
0.34 m

B
1.33 m

C
13.4 m

D
33.9 m

Solution
Question 9
4 / -1

A particle of mass 2 × 10^–5 kg and charge 4 × 10^–3 C moves from rest in a uniform electric field of magnitude 5 V/m. Its kinetic energy after 10 seconds is

A
2 × 10³ J

B
10³ J

C
2 × 10^–3 J

D
10² J

Solution
Question 10
4 / -1

Five identical plates each of area A are joined as shown in the figure. The distance between the plates is d. The plates are connected to a potential difference of V volts. The charge on plates 1 and 4 will be

A

B

C

D

Solution