Question

Capacity of parallel plate condenser remains unaffected on introducing a insulating slab between the plates Electric field intensity between the plates increases on introducing the insulating slab

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (D)

If both assertion and reason are false

Answer 2

If the medium between the plates of a capacitor is filled with an insulating substance, the electric field due to the charged plates induces a net dipole moment in the dielectric. This give rise to field in the opposite direction. The net electric field inside the capacitor decreases and hence the potential difference between the plates is reduced. Consequently, the capacitance $C$ increases from its value, when there is no medium