33. In an L-R-C series circuit as shown below. The current has a very small ampl

Question

33. In an L-R-C series circuit as shown below. The current has a very small amplitude if the ac source oscillates at a very high frequency. Which cireuit element causes this behavior? L-R-C series circuit (a de (a) Misleading questiontbe current actually has a very large 37. amplitude if the frequency is very high (b) The inductor L (e) The capacitor C (d) Two of these elements acting together are necessary. (a) (e)The resistor R 34. A circular loop of wire carries a constant current. If the 38. loop is placed in a region of uniform magnetic field, the net mag magnetic force on the loop: (a) depends ou the magnitude and direction of the current and on the magnitude and direction of the magnetic field. (b) is zero. (c) is in the same plane as the loop (d) is perpendicular to the plane of the loop, in a direetion given by a left-hand rule. (ejis perpendicular to the plane of the loop, in a direction given by a right-hand rule. 35. A sinusoidal voltage V(t)-(200V)Sin (ut) is applied to (a) eit a series RLC circuit with L = 10 mH, C= 100 nF, and R- (b) an is ce 80.0 Cale (c) 4 of th 20.0 ?. Find the arnplitude of the current at resonance? (d) th (e) the 36. In an L-R-C series eircuit as shown below. Suppose 39. A (b) 10 A (d) 5 A (c) 100 A v

Explanation / Answer

33) (b)The inductor L

Since current lags the voltage in RLC circuit.

34)(b) is zero

35)(b)10 A

We know that at resonance

Xl = Xc

Z = R

I = V/Z = 200/20 = 10 A

Hence, I = 10 A

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