Answer to Question #78069 in Electricity and Magnetism for sabine

Question

a solenoid of length 40 cm and number of turns 1000 turns has an axis parallel to the magnetic meridian. a small needle id placed at its center on a vertical pivot. draw the direction of the magnetic needle and that of the horizontal component of the earth's magnetic field indicating the poles of the needle when the solenoid carries no current.
when the solenoid id traversed by a constant current of 0.005A a magnetic field Bs is created inside it: determine the possible values of the resultant magnetic field created at the center of the solenoid and give a clear diagram for each of the possible cases with the diresction of the current and the polarities of the solenoid.

Answer 1

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