Prof Mason is heating up a magnetic metal. Will the magnetism disappear?
Yes.
Question:What is the difference between an ordinary pin and a magnetic pin?
Answer:A magnetic pin has straight line domain. While ordinary pin has random domain
Comp up two ways to destroy magnet:
Heat; Physical destroy like thor(?)
Consider a rectangular current loop as shown below.
According to our work in the previous lesson, the net force on a current loop is 0
Net Torque is shown below
A current loop in a magnetic field can experience forces on its sides which can generate a torque. Consider a rectangular loop with the field in the plane of the loop.
Finally, we use this problem to derive the torque t and magnetic dipole moment u(=NIA) below.
Use these equations to solve the problem
What is the torque on a 50-loop coil of radius 1.00-m in the problem below?
Two-pole DC electric motor.
WHat is the most likely things to break in a motor?
This is a model of motor:
We are going to build out own motor!
Material:
coil, (we build a coil loop and use knife to eliminate the edges at two ends.)
wire,
magnetic metal plates,
batteries,(3)
Initially the motor built by ourselves does not work. The problem is on the brushes.
The coil loop will spin around
THE MAGNETIC FIELD NEAR A CURRENT-CARRYING WIRE
Repeat some of Oersted’s observations and study the pattern of magnetic field lines in a plane perpendicular to a long straight conductor that is carrying current.
Yes, the compasses pointing directions make a circle pattern. which proves the straight current makes up a circular magnetic field
Next, we know that we can magnetic field superposition(can add up) if they are in same direction. They can cancel out if in different direction
Derive the magnetic field formula in terms of u,q V,r,GIVEN Idl=qV
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