26. An ideal battery 3, resistor R, capacitor C and inductor L are connected as

Question

26. An ideal battery 3, resistor R, capacitor C and inductor L are connected as shown. Place the switch on a for a long time, so that the capacitor is fully charged. Then move the switch to b. The magnetic energy then oscillates at a frequency of A) C) 27. Which of the following is wrong about RLC circuits? A) The charge on the capacitor has damped oscillation B) The frequency of the current oscillation is determined by initial conditions C) The electric and magnetic energy is dissipated into thermal energy D) The rate of energy decay is determined by the resistance and inductance E) The phase of the current depends on the initial conditions 28. Two currents, with the same magnitude i but opposite direction, are placed parallel to a half-cylinder, as shown. The distances between each current and the axis of the half- cylinder are both 3R, R is the radius of the half-cylinder. Its length is L. The total magnetic flux through the curved surface of the half-cylinder is A) 0 B) HollIn2 2 2

Explanation / Answer

Solving 1st question

26

Angular frequency for LC circuit=w=1/sqrt(LC)

For energy ,angular frequency will be 2w =2/sqrt(LC)

Frequency=angular frequrncy/2*pi=1/pi*sqrt(LC)

So option (C) is correct

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