How will the effect of the coil magnetic field on the arrow change when the rheostat slider is moved?

| January 15, 2021 | education

How will the effect of the coil magnetic field on the arrow change when the rheostat slider is moved? Left? Right? When the key was closed, the north pole of arrow N turned to the end of the coil closest to it. What is the pole of this end of the coil when the circuit is closed?

When you move the rheostat slider, the effect of the coil’s magnetic field on the arrow will also change. It is important to know how the rheostat is located here. If by moving the slider of the rheostat to the left, we reduce the resistance, then we thereby increase the current strength, therefore, the effect of the magnetic field of the coil on the arrow increases. Conversely, if by shifting the slider of the rheostat to the right, we increase the resistance, then we thereby reduce the current strength, therefore, the effect of the magnetic field of the coil on the arrow decreases.
The coil will have a south pole when closed. Because opposite poles are attracted.



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