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wati / 13 A parallel plate capariter filled with air care. The battery is disconnected, and...

wati / 13 A parallel plate capariter filled with air care. The battery is disconnected, and a slab of material with directric constant k = 2 is inserted between the plates. Which of following statements is TRUE ?
1. The voltage across the capacitor is doubled 2. The charge on the plates is doubled 3. The charge on the plates decreases by a factor of 4 The voltage across the capacitor decreases by a factor of 5. The electric field is doubled.

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