Physics 222 supplemental instruction

Class 24 A little of everything November 8th, 2017

1. For the two solenoids shown, if l = 50 cm, N1 = N2 = 200 turns, and r1 = 5.0 cm and r2 = 10.0 cm, the mutual inductance of the two solenoids isA. 0.79 mHB. 1.58 mHC. 3.2 mHD. 6.31 mHE. 18.2 mH

2. When an LRC series circuit is at resonance, which one of the following statements about that circuit is accurate? (There may be more than one correct choice)A. The current amplitude is a maximum.B. The reactance of the inductor is zeroC. The reactance due to the inductor and capacitor has its maximum value.D. The impedance has its maximum value.E. The reactance of the capacitor is zero.

3. Consider a LC circuit with a single inductor, L = 8 mH and a single capacitor, C = 20 µF. The circuit is connected with the capacitor initially charge. What is not true about this circuitA. The current through the inductor oscillates with = 2.5 x 103 rad / s.B. The voltage across the inductor is 180 out of phase with the voltage across the

capacitor.C. When the capacitor is fully charged, current through the inductor is zero.D. The maximum energy stored in the inductor is larger than the maximum energy

stored in the capacitor since L is larger than C.E. Energy will be conserved in the electric and magnetic fields of the capacitor and

inductor.4. Consider a lamp that emits essentially monochromatic green light uniformly in all

directions. If the lamp is 3% efficient and consumes 100 W of power, so the light that is emitted is 3W. Find the amplitude of the electric field associated with the electromagnetic radiation at a distance 10 m from the lamp.A. 2.7 V / mB. 1.8 V / mC. 7.2 V / mD. 1.3 V / m

5. Lamps with resistances 8.0 , 12.0 , and 24 are connected in parallel across a 9.0 V battery. Which of the following statements is correct?A. The 8.0 lamp dissipates the greatest power.B. The 24 map dissipates the greatest power.C. All lamps dissipate the same power when connected in parallel.D. The electric potential drop across the 24 lamp is freater than the electric potential

drop across the 8.0 lamp.E. The current through the 12.0 lamp is greater than the current through the 8.0

lamp.