Electrostatics Test

Result

Electrostatics Test - 53

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Weekly Quiz Competition

Question 1
4 / -1

A
Zero

B

C
π

D

Solution
Question 2
4 / -1

A region surrounding stationary electric dipoles has

A
Magnetic field only

B
Electric field only

C
Both electric and magnetic fields

D
No electric and magnetic fields
Question 3
4 / -1

Two electric dipoles of moment P and 64 P are placed in opposite direction on a line at a distance of 25 cm. The electric field will be zero at point between the dipoles whose distance from the dipole moment P is

A
5 cm

B

C
10 cm

D

Solution
Question 4
4 / -1

A
90°

B
0°

C
180°

D
45°
Question 5
4 / -1

A
1

B
4

C
3

D
2

Solution
Question 6
4 / -1

A
0.245 J

B
2.45 J

C
0.0245 J

D
24.5 J

Solution
Question 7
4 / -1

A sample of HCl gas is placed in an electric field of 3 × 10⁴ NC^–1. The dipole moment of each HCl molecule is 6 × 10^–30 C × m. The maximum torque that can act on a molecule is

A
2 × 10^–34 C² N^–1m

B
2 × 10^–34 Nm

C
18 × 10^–26 Nm

D
0.5 × 10^–34 C^–2 N^–1m^–1

Solution
Question 8
4 / -1

The electric field and the potential of an electric dipole vary with distance r as

A

B

C

D
Question 9
4 / -1

A dipole of electric dipole moment p is placed in a uniform electric field of strength E. If θ is the angle between positive directions of p and E, then the potential energy of the electric dipole is largest when θ is

A

B

C

D
Zero

Solution
Question 10
4 / -1

A disk of radius a/4 having a uniformly distributed charge 6C is placed in the x–y plane with its centre at (–a/2, 0, 0). A rod of length a carrying a uniformly distributed charge 8 C is placed on the a-axis from x = a/4 to x = 5a/4. Two point charges –7 C and 3 C are placed at (a/4, – a/4, 0) and(–3 a/4, 3 a/4, 0), respectively. Consider a cubical surface formed by six surfaces x = ± a / 2, y = ± a / 2, z = ±a / 2. The electric flux through this cubical surface is

A

B

C

D

Solution