Solved: PHYSICS Question for NEET

NEET PHYSICSEasy

A parallel plate capacitor is charged by connecting it to a battery through a resistor. If $i$ is the current in the circuit, then in the gap between the plates:

A displacement current of magnitude equal to $i$ flows in the same direction as $i$ .

A displacement current of magnitude equal to $i$ flows in the opposite direction to $i$ .

A displacement current of magnitude greater than $i$ flows but it can be in any direction.

There is no current.

Step-by-Step Solution

Concept: Displacement current ( $i_d$ ) is the current that comes into existence in a region where the electric field (and electric flux) is changing with time.
Continuity: According to Maxwell, the sum of conduction current ( $i_c$ ) and displacement current ( $i_d$ ) has the property of continuity along any closed path. Outside the capacitor plates, $i_d = 0$ and $i_c = i$ . Inside the gap between the plates, $i_c = 0$ and $i_d$ exists.
Magnitude and Direction: To maintain continuity, the displacement current inside the capacitor must be equal in magnitude to the conduction current in the connecting wires ( $i_d = i$ ). Furthermore, it flows in the same direction as the conduction current entering the positive plate and leaving the negative plate. (Note: This topic is typically found in Class 12 Physics, Chapter 8 'Electromagnetic Waves', which is not included in the provided Class 11 Physics or Class 12 Chemistry sources).

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