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Free CBSE - Class 12 Physics - Electric Charges and Fields worksheets

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1.
Explain the meaning of the statement ‘electric charge of a body is quantised’.
2.
Why can one ignore quantisation of electric charge when dealing with macroscopic i.e., large scale charges?
3.
When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain how this observation is consistent with the law of conservation of charge.
4.
Four point charges $q_A = 2 \mu C$, $q_B = -5 \mu C$, $q_C = 2 \mu C$, and $q_D = -5 \mu C$ are located at the corners of a square ABCD of side 10 cm. What is the force on a charge of $1 \mu C$ placed at the centre of the square?
5.
An electrostatic field line is a continuous curve. That is, a field line cannot have sudden breaks. Why not?
6.
Explain why two field lines never cross each other at any point?
7.
Two point charges $q_A = 3 \mu C$ and $q_B = -3 \mu C$ are located 20 cm apart in vacuum. (b) If a negative test charge of magnitude $1.5 \times 10^{-9}$ C is placed at this point, what is the force experienced by the test charge?
8.
A system has two charges $q_A = 2.5 \times 10^{-7}$ C and $q_B = -2.5 \times 10^{-7}$ C located at points A: (0, 0, –15 cm) and B: (0,0, +15 cm), respectively. What are the total charge and electric dipole moment of the system?
9.
An electric dipole with dipole moment $4 \times 10^{-9}$ C m is aligned at $30^{\circ}$ with the direction of a uniform electric field of magnitude $5 \times 10^4$ NC$^{-1}$. Calculate the magnitude of the torque acting on the dipole.
10.
Two large, thin metal plates are parallel and close to each other. On their inner faces, the plates have surface charge densities of opposite signs and of magnitude $17.0 \times 10^{-22}$ C/m$^2$. What is $E$: (c) between the plates?
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