Electrostatics Test

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Electrostatics Test - 105

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Question 1
4 / -1

A charged particle is suspended in equilibrium in a uniform vertical electric field of intensity 20000 V/m. If mass of the particle is 9.6 × 10^–16 C, 3 kg, the charge on it and excess number of electrons on the particle are respectively (g = 10 m/s²)

A
4.8 × 10^–19 C,3

B
5.8 × 10^–19 C,4

C
3.8 × 10^–19 C, 2

D
2.8 × 10^–19 C, 41

Solution
Question 2
4 / -1

Four charges +Q, – Q, + Q, – Q are placed at the corners of a square taken in order. At the centre of the square

A
E = 0, V = 0

B
E = 0, V ≠ 0

C
E ≠ 0, V = 0

D
E ≠ 0, V ≠ 0

Solution
Question 3
4 / -1

Top of the stratosphere has an electric field E (in units of V/m) nearly equal to

A
0

B
10

C
100

D
1000
Question 4
4 / -1

Charge q, 2q, 3q and 4q are placed at the corners A, B, C and D of a square as shown in the following figure. The direction of electric field at the centre of the square is along

A
AB

B
CB

C
BD

D
AC

Solution
Question 5
4 / -1

Point charges q₁ = 2 µC and q₂ = –1 µC are kept at points x = 0 and x = 6 respectively. Electrical potential will be zero at points

A
x = 2 and x = 9

B
x = 1 and x = 5

C
x= 4 and x = 12

D
x = –2 and x = 2

Solution
Question 6
4 / -1

Equipotential surfaces associated with an electric field which is increasing in magnitude along the x-direction are

A
Planes parallel to toyz–plane

B
Planes parallel to xy–plane

C
Planes parallel to xz–plane

D
Coaxial cylinders of increasing radii around the x-axis

Solution
Question 7
4 / -1

A bullet fo mass 2 gm is having a charge of 2µC. Through what potential difference must it be accelerated, starting from rest, to acquire a speed of 10 m/s

A
5 kV

B
50 kV

C
5 V

D
50 V

Solution
Question 8
4 / -1

The points resembling equal potentials are

A
P and Q

B
S and Q

C
S and R

D
P and R
Question 9
4 / -1

Figure shows three points A, B and C in a region of uniform electric field E ⃗. The line AB is perpendicular and BC is parallel to the field lines. Then which of the following holds good. Where V_A,V_Band V_C represent the electric potential at points A, B and C respectively

A
V_A = V_B = V_C

B
V_A = V_B> V_C

C
V_A = V_B< V_C

D
V_A> V_B = V_C
Question 10
4 / -1

In a certain charge distribution, all points having zero potential can be joined by a circle S. Points inside S have positive potential and points outside S have negative potential. A positive charge, which is free tomove, is placed inside S

A
It will remain in equilibrium

B
It can move inside S, but it cannot cross S

C
It must cross S at some time

D
It may move, but will ultimately return to its starting point