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8. Electromagnetic waves — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics8. Electromagnetic waves1 Mark
MCQ
A parallel plate capacitor is charged by connecting it to a battery through a resistor. If $l$ is the current in the circuit, then in the gap between the plates:
  • ✓
    Displacement current of magnitude equal to / flows in the same direction as /
  • B
    Displacement current of magnitude equal to / flows in a direction opposite to that of $I$
  • C
    Displacement current of magnitude greater than / flows but can be in any direction
  • D
    There is no current
✓

Answer

Correct option: A.
Displacement current of magnitude equal to / flows in the same direction as /
a
According to modified Ampere's law

$\oint B \cdot d l=\mu_0\left(I_C+I_D\right)$

$\text { For Loop } L_1 \quad I_C \neq 0 \text { and } I_D=0$

$\text { For Loop } L_2 \quad I_C=0 \text { and } I_D \neq 0$

$\text { Due to KCL } \quad I_C=I_D$

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