In FIGURE, what is the current supplied by the emf when

(a) the frequency is very small and

(b) the frequency is very large

Short Answer

Expert verified

(a) The current supplied by the emf when frequency is very small is 0.10A.

(b) The current supplied by the emf when frequency is very large is0.20A.

Step by step solution

01

Part (a) Step 1  : Given information

We are given that the values of

R1=100ΩR2=50Ωεo=10V

And We have to find the current supplied by emf when the frequency is very small .

02

Part (a) Step 2: Explanation 

When the frequency is very small then the branch with inductor has a very small XL

so

We get,localid="1649933493454" Z=R1I=10100I=0.10A

Hence the current is0.10A.

03

Part (b) Step 1: Given information

We are given that the values of 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εo=10V

and we have to find the current supplied by emf when the frequency is very large .

04

Part (b) Step 2: Explanation

When the frequency is very large then the branch with capacitor has a very small

so Z=R2

Irms=1050Irms=0.20AOn solving we get,

Hence the current is 0.20A.

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Most popular questions from this chapter

Commercial electricity is generated and transmitted as three-phase electricity. Instead of a single emf, three separate wires carry currents for the emfs E1=E0cosvt,E2=E0cos1vt+120°,andE3=E0cos1vt-120°over three parallel wires, each of which supplies one-third of the power. This is why the long-distance transmission lines you see in the countryside have three wires. Suppose the transmission lines into a city supply a total of 450MWof electric power, a realistic value.

a. What would be the current in each wire if the transmission voltage were E0=120Vrms?

b. In fact, transformers are used to step the transmission-line voltage up to 500kVrms. What is the current in each wire?

c. Big transformers are expensive. Why does the electric company use step-up transformers?

The current lags the emf by 30° in a series RLC circuit with E0=10V and R=50. What is the peak current through the circuit?

A series RLC circuit has a 200kHz resonance frequency. What is the resonance frequency if

a. The resistor value is doubled?

b. The capacitor value is doubled?

The telecommunication circuit shown in FIGURE CP32.71 has a parallel inductor and capacitor in series with a resistor.

a. Use a phasor diagram to show that the peak current through the resistor is

I=ε0R2+(1XL-1XC)-2

b. What is I in the limits ω0and ω?

c. What is the resonance frequency ω0? What is I at this frequency?

The current in a series RLC circuit lags the EMF by 20°. You cannot change the EMF. What two different things could you do to the circuit that would increase the power delivered to the circuit by the EMF?

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