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Electric Field and Potential Physics - Electric Field and Potential

Rajasthan Board (RBSE) - STD 12 Science - Physics (Rajasthan - English Medium). 107 questions in this chapter.

Question types

Electric Field and Potential question types

107 questions across 5 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

107
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5
Question groups
5
Question types
Sample Questions

Electric Field and Potential questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark
Consider the situation of figure. The work done in taking a point charge from $P$ to $A$ is $W_A,$ from $P$ to $B$ is $W_B$ and from $P$ to $C$ is $W_C.$
  • A
    $W_A < W_B < W_C$
  • B
    $W_A > W_B > W_C$
  • ✓
    $W_A = W_B = W_C$
  • D
    None of these.

Answer: C.

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Q 2M.C.Q (1 Marks)1 Mark
If a body is charged by rubbing it, its weight
  1. Remains precisely constant.
  2. Increases slightly.
  3. Decreases slightly.
  4. May increase slightly or may decrease slightly.
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Q 3M.C.Q (1 Marks)1 Mark
The electric potential decreases uniformly from $120V$ to $80V$ as one moves on the $x-$axis from $x = -1\ cm$ to $x = + 1\ cm$. The electric field at the origin.
  1. Must be equal to $20Vcm^{-1}$
  2. May be equal to $20Vcm^{-1}$
  3. May be greater than $20Vcm^{-1}$
  4. May be lees than $20Vcm^{-1}$
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Q 4M.C.Q (1 Marks)1 Mark
The electric field and the electric potential at a point are E and V respectively.
  1. If E = 0, V must be zero.
  2. If V = 0, E must be zero.
  3. If $\text{E}\neq0,$ V cannot be zero.
  4. If $\text{V}\neq0,$ E cannot be zero.
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Q 5M.C.Q (1 Marks)1 Mark
Figure, shows some of the electric field lines corresponding to an electric field. The figure suggests that,
  • A
    $E_A > E_8 > E_e$
  • B
    $E_A = E_B = E_e$
  • ✓
    $E_A = E_c > E_B$
  • D
    $E_A = E_c < E_B.$

Answer: C.

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Q 61 Marks Question1 Mark
NaCl molecule is bound due to the electric force between the sodium and the chlorine ions when one electron. of sodium is transferred to chlorine. Taking the separation between the ions to be 2.75 × 10cm, find the force of attraction between them· State the assumptions (if any) that you have made.
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Q 71 Marks Question1 Mark
A sample of $\text{HCI}$ gas is placed in an electric field of $2.5 \times 10^4NC^{-1}.$ The dipole moment of each $\text{HCI}$ molecule is $3.4 \times 10^{-30}Cm.$ Find the maximum torque that can act on a molecule.
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Q 81 Marks Question1 Mark
Two charged particles are placed at a distance $1.0\ cm$ apart. What is the minimum possible magnitude of the electric force acting on each charge?
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Q 101 Marks Question1 Mark
Two charged particles having charge $2.0 \times 10^{-8}C$ each are joined by an insulating string of length $1m$ and the system is kept on a smooth horizontal table. Find the tension in the string.
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Q 112 Marks Questions2 Marks
A hydrogen atom contains one proton and one electron. It may be assumed that the electron revolves in a circle of radius $0.53$ angstrom $(1$ angstrom $= 10^{-10}m$ and is abbreviated as $A)$ with the proton at the centre. The hydrogen atom is said to be in the ground state in this case. Find the magnitude of the electric force between the proton and the electron of a hydrogen atom in its ground state.
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Q 122 Marks Questions2 Marks
The charge on a proton is $+1.6 \times 10^{-19}C$ and that on an electron is $-1.6 \times 10^{-19}C.$ Does it mean that the electron has a charge $3.2 \times 10^{-19}C$ less than the charge of a proton?
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Q 142 Marks Questions2 Marks
An electric field $\vec{\text{E}}=\vec{\text{i}}\text{Ax}$ exists in the space, where $A= 10Vm^{-2}.$ Take the potential at $(10m, 20m)$ to be zero. Find the potential at the origin.
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Q 152 Marks Questions2 Marks
Consider a gold nucleus to be a sphere of radius 6.9 fermi in which protons and neutrons are distributed. Find the force of repulsion between two protons situated at largest separation. Why do these protons not fly apart under this repulsion?
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Q 163 Marks Question3 Marks
Assume that each atom in a copper wire contributes one free electron. Estimate the number of free electrons in a copper wire having a mass of $6.4g ($take the atomic weight of copper to be $64\ g\ mol^{-1}.)$
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Q 173 Marks Question3 Marks
A 10cm long rod carries a charge of $+50\mu\text{C}$ distributed uniformly along its length. Find the magnitude of the electric field at a point 10cm from both the ends of the rod.
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Q 183 Marks Question3 Marks
The number of electrons in an insulator is of the same order as the number of electrons in a conductor. What is then the basic difference between a conductor and an insulator?
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Q 193 Marks Question3 Marks
A particle having a charge of $2.0 \times 10^{-4}C$ is placed directly below and at a separation of $10\ cm$ from the bob of a simple pendulum at rest. The mass of the bob is $100g.$ What charge should the bob be given so that the string becomes loose?
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Q 203 Marks Question3 Marks
An electric field of $20NC^{-1}$ exists along the $x-$axis in space. Calculate the potential difference $V_B - V_A$ where the points $A$ and $B$ are given by,
  1. $A = (0, 0); B = (4m, 2m)$
  2. $A = (4m, 2m); B = (6m, 5m)$
  3. $A = (0, 0); B = (6m, 5m)$
Do you find any relation between the answers of parts $(a), (b) $and $(c)?$
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Q 215 Marks Questions5 Marks
Suppose the second charge in the previous problem is $-1.0 \times 10^{-6}C.$ Locate the position where a third charge will not experience a net force.
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Q 225 Marks Questions5 Marks
Two particles A and B having charges q and 2q respectively are placed on a smooth table with a separation d. A third particle C is to be clamped on the table in such a way that the particles A and B remain at rest on the table under electrical forces. What should be the charge on C and where should it be clamped?
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Q 245 Marks Questions5 Marks
Two identical pith balls, each carrying a charge q, are suspended from a common point by two strings of equal length l. Find the mass of each ball if the angle between the strings is $2\theta$ in equilibrium.
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