-Which one of the following quantities remains constant for a given LC circuit?
ID: 1789913 • Letter: #
Question
-Which one of the following quantities remains constant for a given LC circuit?
1)the energy stored in the inductor.
2) the energy stored in the current flowing in the circuit.
3)the energy stored in the capacitor.
4)the energy dissipated in the circuit.
5)the sum of the energy stored in the capacitor and that in the inductor.
-Which one of the following statements concerning the electrical and magnetic energies stored in an LC circuit is FALSE?
1)At any time, the sum of the electric and magnetic energies is a constant equal to Q2/2C.
2)The electric energy (energy stored in the capacitor) is at its minimum when the magnetic energy (energy stored in the inductor) is zero joules.
3)The magnetic energy is at its maximum when the electric energy is zero joules.
4)The maximum values of both the electric and magnetic energies is Q2/2C.
Explanation / Answer
answer is
5) the sum of the energy stored in the capacitor and that in the inductor.
because an LC circuit if we assume both inductor and capacitor idial there is no resistance so there is no energy decipation but practically there is loss resulting from small non zero resistance .
the statement 2) is correct
because the capacitor C and inductor L is series connection initially charge on the capacitor Q,
the electric energy stored in the capacitor Ue=Q^2/2C
the magnetic field energy stored in the inductor UB= zero.
other three statements are false .
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