Class 12 Electric Charges and Fields Mock Test (CBSE)

Topics in Electric Charges and Fields

• Electric charge
• Conductors and insulators
• Charging by induction
• Basic properties of electric charge
• Coulomb's law
• Forces between multiple charges
• Electric field
• Electric field lines
• Electric flux
• Electric dipole
• Dipole in a uniform external field
• Continuous charge distribution
• Gauss's law
• Applications of Gauss's law

Electric Charges and Fields practice questions with answers

1. Q1Multiple choice·1 mark
   Which of the following statements is true for the electrostatic field inside a charged conductor in electrostatic equilibrium?

   1. (a)It depends on the total charge on the conductor.
   2. (b)It is zero.
   3. (c)It is directed radially outward.
   4. (d)It is non-zero and uniform.
   Show answer and step marks

   1. Correct option: (b) It is zero. In electrostatic equilibrium, free charge carriers inside a conductor rearrange themselves such that the internal electric field is precisely zero everywhere inside the material.+1

   Answer: (b)
2. Q2Multiple choice·1 mark
   Which of the following fundamental properties of electric charge is universally valid for an isolated system?

   1. (a)Charge is dependent on the velocity of the moving body.
   2. (b)The magnitude of charge can take any continuous real value.
   3. (c)The total electric charge of the system is always conserved.
   4. (d)Charge can exist independently without any associated mass.
   Show answer and step marks

   1. Correct option: (c) The total electric charge of the system is always conserved. According to the principle of conservation of charge, the total electric charge of an isolated system is always conserved. Furthermore, electric charge is invariant with speed and is quantized. Therefore, option (c) is the correct statement.+1

   Answer: (c)

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