Q. Between the plates of a parallel plate capacitor a dielectric plate is introduced just to fill the space between the plates. The capacitor is charged and later disconnected from the battery. The dielectric plate is slowly drawn out of the capacitor parallel to the plates. The plot of the potential difference across the plates and the length of the dielectric plate drawn out is
A) [image:1_image223.emf]
B) [image:1_image224.emf]
C) [image:1_image225.emf]
D) [image:1_image226.emf]
Explanation
(b) While drawing the dielectric plate outside, the capacitance decreases till the entire plate comes out and then becomes constant. So, $V$ increases and then becomes constant
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.