In the inductance experiment, we know the emf is zero when the magnet at the mid

Question

In the inductance experiment, we know the emf is zero when the magnet at the middle of the solenoid. Which description is correct at the moment ?

Flag this Question

Question 51 pts

Suppose we have a resistor R1 = 10 ohm tied in series with a parallel combination of two resistors R2 = 10 ohm and R3 = 5 ohm. The battery supplies is 5 V. What is the current pass through R3?

Flag this Question

Question 61 pts

To point out the RC time constant t=RC, we use oscilloscope to display the plot of Voltage vs time of a discharge process. The initial Voltage is 8 V, at time 5s the voltage is 3.5s. What is the time constant t=RC

Explanation / Answer

Here ,

for the magnet at the middle of the solenoid

as the magnetic flux will be constant when the magnet is moving in the solenoid.

the correct option is

The changing of magnetic flux is zero

------------------------------------

51)

for the net resistance

Req = R1 + (R2 || R3)

Req = 10 + (10 * 5/(10 + 5))

Req = 13.33 Ohm

current in battery , I = V/Req

I = 5/13.33

I = 0.375 A

current in R3 = I * R2/(R2 + R3)

current in R3 = 0.375 * 10/(10 + 5)

current in R3 = 0.25 A

the current in R3 is 0.25 A

61)

------------------------------

as Vo = 8 V

as V = 3.5 V

let the time constant is T

as V = Vo * (1 - e^(-t/T))

3.5 = 8 * (1 - e^(-5/T))

solving for T

T = 8.6 s

the time constant is 8.6 s

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

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