NEET 2010 Physics question
A condenser of capacity is charged to a potential difference of . The plates of the condenser are then connected to an ideal inductor of inductance . The current through the inductor when the potential difference across the condenser reduces to is
Answer: (4)
Solution
By conservation of energy in the ideal LC circuit, the initial electrical energy equals the sum of electrical and magnetic energies at any later instant: . Hence and $I =
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