a) Explain what direction the magnetic field created by the wire must point in order to deflect the compass needle as describedb) What must be the direction of the current in the wire?c) What is the magnitude of the current (in A)? BearthBearth150CompassCompassOersted's experiments showed that current in a wire can deflect compass needles. Let's go through thecalculations of such an experiment.Say you have a compass needle that's originally oriented int the direction of the earth's magnetic field(assume that at this location, the Bearth = 25µT in the direction of the original compass needleorientation) . You then move a wire (assume infinitely long), that is oriented in the direction of theearth's magnetic field, on top of the compass. Assume that the distance between the wire center andthe compass needle is 4 mm. The compass needle deflects 15° counter-clockwise when the current isturned on.

We have to find the magnitude of current.

Answered: a) Explain what direction the magnetic…

Physics for Scientists and Engineers: Foundations and Connections

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ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter30: Magnetic Fields And Forces

Section: Chapter Questions

Problem 50PQ: Two ions are accelerated from rest in a mass spectrometer operating with potential difference V. The...

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a) Explain what direction the magnetic field created by the wire must point in order to deflect the
compass needle as described
b) What must be the direction of the current in the wire?
c) What is the magnitude of the current (in A)?

Bearth
Bearth
150
Compass
Compass
Oersted's experiments showed that current in a wire can deflect compass needles. Let's go through the
calculations of such an experiment.
Say you have a compass needle that's originally oriented int the direction of the earth's magnetic field
(assume that at this location, the Bearth = 25µT in the direction of the original compass needle
orientation) . You then move a wire (assume infinitely long), that is oriented in the direction of the
earth's magnetic field, on top of the compass. Assume that the distance between the wire center and
the compass needle is 4 mm. The compass needle deflects 15° counter-clockwise when the current is
turned on.

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