electromagnet is made by wrapping wire around a vertical, iron cylinder. The pow
ID: 1998321 • Letter: E
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electromagnet is made by wrapping wire around a vertical, iron cylinder. The power source is an a.c. power supply. A conducting ring is placed on top of the cylinder. The power supply is then turned on. + Homework 15 Question 1 An electromagnet is made by wrapping wire around a vertical, ion cylinder The power souroe is an ac power supply A conducting ring is placed on top of the cylinder. The power supply is then turned on. Over a single cycle of the power supply's current output, indicate whether the electromagnet wil attract or repel the conducting ring during each of the four sections of the period shown below. A ring of radius R/2 is place inside a solenoid of radius R and length L and loop density n. Assume that the magnetic field due to the solenoid is constant everywhere within the solenoid. a. What is the magnetic flux through the ring when a constant current oflis running through the b. What is the mutual inductance between the ring and the solenoid? c. What is the magnetic flux through the solenoid when a constant current oflis running through the ring? page 1Explanation / Answer
1)We know that same direction current attracts and opposite repel.
In first section, current in electromagnet is clockwise.
Since current in electromagnet is increasing, by Lenz law,current induced in loop is counterclockwise.
So they will repel.
In second section, current in electromagnet is clockwise, but decreasing, so current in loop is clockwise.
So they will attract.
In third section, current in electromagnet is counterclockwise, and increasing, so current in loop is clockwise.
So they will repel.
In fourth section, current in electromagnet is counterclockwise, and decreasing , so current in loop is counterclockwise.
So they will attract.
So they will repel.
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