Quiz on Chapter 23 Flashcards
A magnetic field is oriented at an angle of 47 degrees to the normal of a rectangular area 0.051m by 0.068m. If the magnitude flux through this surface has a magnitude of 4.8E-5 Txm^2 what is the strength of the magnetic field?
MRI Soleniod: The magnetic field produced by an MRO solenoid 2.5m long and 1.2m in diameter is 1.7T. Find the magnitude of the magnetic flux through the core of a solenoid.
A solenoid with 385 turns per meter and a diameter of 0.17m has a magnetic flux through its core of magnitude 1.28E-4 Txm^2. Find the current in this solenoid. How would your answer to part a change in the diameter of the solenoid were doubled? Explain.
This figure shows the magnitude flux through a single loop coil as a function of time. What is the induced emf in the coil at t= 0.05s, t= 0.15s, and t=0.50s?
I= (N)BA = (N)BAcos(Ø) (Usually we don’t use N)
Where N= Number of turns on the wire
At t= 0.05sec
£= -Change in Epsilon/ Change in time > £= (10Wb-0Wb) / (0.1s-0s) £= -100V
*Change value to volts
ON QUIZ: A long straight wire carrie a current I, as indicated in the fure. Three small metal rings are placed near the current carrying wire (A and C) or directly on top of it. If the current in the wire is increasing with time, indicate whether the induced emf in each of the rings is clockwise, counterclockwise or zero. Explain your answer for each ring.
Use Right Hand Rule:
Thumb- Force
Pointer Finger- Current
Middle Finger- Magnetic Field
Ring B: Epsilon= BAcos(0) + BAcos(180) = 1 + -1 = 0
Consider the RL circuit shown in the figure. When the switch is closed, the current in the circuit is observed to increase from 0 to 0.32A in 0.15s. What is the inductance L? How long after the switch is closed does the current have the value 0.50A? What is the maximum current that flows in this circuit?
A single conducting loop of wire has an area of 7.2E-2m^2 and a resistance of 110 ohms. Perpendicular to the plane of the loop is a magnetic field of strength 0.48T. At what reate (in T/s) must this field change if the induced current in the loop is to be 0.32A?
A rectangular loop of wire 0.24m by 72m is bent into an L shape as shown in the figure. The magnetic field in the vicinity of the loop has a magnitude of 0.035T and points in a direction 25 degrees below the Y-axis. The magnetic field has no x component. Find the magnitude of the magnetic flux through the loop.
Consider the circuit shown in the figure 23-39. Assuming the inductor in this circuit has the value l= 6.1mH, how much energy is stored in the inductor after the switch has been closed a long time?
