NEET 2015 Physics question
A parallel plate air capacitor of capacitance is connected to a cell of emf and then disconnected from it. A dielectric slab of dielectric constant , which can just fill the air gap of the capacitor, is now inserted in it. Which of the following is incorrect ?
Answer: (3)
Solution
After the battery is disconnected the plates are isolated, so the charge stays constant at ; statement (3) is therefore incorrect. On inserting the dielectric the capacitance becomes . Potential difference
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