JEE Mains · Physics · STD 12 - Electric potential and capacitance
- JEE Mains 2026
- Medium
- MCQ
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: In electrostatics, a conductor does not store any net charge inside.
Reason R: Inside the capacitor (with no dielectric medium), the free charge carriers, if placed between the plates of capacitor, experience force and drift.
Choose the correct answer from the options given below
Pick an option to check your answer.
Answer & Solution
Correct Answer
(B) Both A and R are true but R is NOT the correct explanation of A
Step-by-step Solution
Detailed explanation
In electrostatics, the electric field inside a conductor is zero. According to Gauss's law, \(\oint \vec{E} \cdot d\vec{s} = \dfrac{q_{in}}{\epsilon_0}\). Since \(\vec{E} = 0\) everywhere inside the conductor, the net charge enclosed \(q_{in}\) must be zero. Thus, a conductor does not store any net charge inside its bulk, and any excess charge resides only on its surface. Assertion A is true.
Inside a capacitor with no dielectric medium, a uniform electric field exists between the plates. If free charge carriers are placed in this region, they will experience an electrostatic force \(\vec{F} = q\vec{E}\) and will drift towards the respective oppositely charged plates. Reason R is true.
Although both statements are factually correct, the behavior of charge carriers in the electric field of a capacitor does not explain why the net charge inside a conductor is zero in electrostatics. Therefore, both A and R are true but R is NOT the correct explanation of A.
Answer: Both A and R are true but R is NOT the correct explanation of A
Inside a capacitor with no dielectric medium, a uniform electric field exists between the plates. If free charge carriers are placed in this region, they will experience an electrostatic force \(\vec{F} = q\vec{E}\) and will drift towards the respective oppositely charged plates. Reason R is true.
Although both statements are factually correct, the behavior of charge carriers in the electric field of a capacitor does not explain why the net charge inside a conductor is zero in electrostatics. Therefore, both A and R are true but R is NOT the correct explanation of A.
Answer: Both A and R are true but R is NOT the correct explanation of A
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