If the current flowing in a coil is reduced to half of its original value, the relaticn between the new energy (E2) and the original energy (E1) stored in the coil will be
(A) E2 = E1
(B) E2 = 2E1
(C) E2 = $1\over2$E1
(D) E2 = $1\over4$E1
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Ans : (D) E2 = $1\over4$E1
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