Part A 1. How many turns of wire would be required to make a 140-mH inductor out

Question

Part A

1. How many turns of wire would be required to make a 140-mH inductor out of a 25.0-cm-long air-filled solenoid with a diameter of 6.0 cm ?

2. The magnetic field inside an air-filled solenoid 39 cm long and 4.0 cmin diameter is 0.62 T .

Part A

Approximately how much energy is stored in this field?

3. It takes 2.55 ms for the current in an LR circuit to increase from zero to 0.68 its maximum value.

Part A

Determine the time constant of the circuit.

Express your answer to two significant figures and include the appropriate units.

Part B

Determine the resistance of the circuit if 35.0 mH .

Express your answer to two significant figures and include the appropriate units.

4. A 2.8-k resistor and a 3.1-F capacitor are connected in series to an ac source.

Part A

Calculate the impedance of the circuit if the source frequency is 55 Hz .

Part B

Calculate the impedance of the circuit if the source frequency is 55000 Hz .

Explanation / Answer

1.

We use equation for inductance of Solenoid as below,

L = µ0N2A/L’

Where L= inductance, L’= length, N= no og truns, A = area

Rearranging, N = sqrt[(LL’)/( µ0A)] = sqrt[(LL’)/(µ0r2)]

Plug values,

N=sqrt[(140*10^-3*0.25)/(4*10^-7**0.03^2)]=

N = 3139

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.