A dielectric slab of thickness d is inserted in a parallel plate capacitor whose negative plate is at x = 0 and positive plate is at x = 3d. The slab is equidistant from the plates. The slab is equidistant from the plates. The capacitor is given some charge. As x goes from 0 to 3 d:
The magnitude of the electric field remains the same
The direction of the electric field remains the same
the electric potential increase continuously.
The electric potential increase at first, then decreases and again increase

Question

A dielectric slab of thickness d is inserted in a parallel plate capacitor whose negative plate is at x = 0 and positive plate is at x = 3d. The slab is equidistant from the plates. The slab is equidistant from the plates. The capacitor is given some charge. As x goes from 0 to 3 d:
The magnitude of the electric field remains the same
The direction of the electric field remains the same
the electric potential increase continuously.
The electric potential increase at first, then decreases and again increase

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