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NEET 2019
Exam
NEET
Year
2019
Subject
Physics
Chapter
Capacitance

NEET 2019 · Physics · Capacitance

A parallel plate capacitor of capacitance 20 is being charged by a...

A parallel plate capacitor of capacitance 20\muF20\text{\mu}F is being charged by a voltage source whose potential is changing at the rate of 3Vs−13V{s}^{- 1}. The conduction current through the connecting wires, and the displacement current through the plates of the capacitor would be, respectively:

Options

  1. Azero,60\muA, 60\text{\mu}A
  2. B60\muA,60\muA60\text{\mu}A, 60\text{\mu}A
  3. C60\muA,60\text{\mu}A, zero
  4. Dzero, zero

Correct answer

B. 60\muA,60\muA60\text{\mu}A, 60\text{\mu}A

Step-by-step solution

q=CVq = CV
dqdt=Cdvdt\dfrac{\text{d}q}{\text{d}t} = C\dfrac{\text{d}v}{\text{d}t}
=20×10−6×3= 20 \times {10}^{- 6} \times 3
Conduction current =60μA= 60\mu A
Displacement current =ε0dϕedt= {ε}_{0}\dfrac{d{ϕ}_{e}}{dt}
=ε0AddVdt= {ε}_{0}\dfrac{A}{d}\dfrac{dV}{dt}
=60μA= 60\mu A

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