a current-carrying rod ab is suspended perpendicularly to the magnetic field produced by a horseshoe magnet .close the key and observes what happens to the rod questions a)what was the effect of reversing the terminals of the battery b) what was the effect of reversing the poles of the magnet c) what happens when ab is kept parallel to the magnetic field
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Answer:
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Answer:
If you hold a compass near a wire through which current is flowing, the needle on the compass will be deflected.
Since compasses work by pointing along magnetic field lines, this means that there must be a magnetic field near the wire through which the current is flowing.
The magnetic field produced by an electric current is always oriented perpendicular to the direction of the current flow. Below is a sketch of what the magnetic field around a wire looks like when the wire has a current flowing in it. We use \(\vec{B}\) to denote a magnetic field and arrows on field lines to show the direction of the magnetic field. Note that if there is no current there will be no magnetic field.
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The direction of the current in the conductor (wire) is shown by the central arrow. The circles are field lines and they also have a direction indicated by the arrows on the lines. Similar to the situation with electric field lines, the greater the number of lines (or the closer they are together) in an area the stronger the magnetic field.
Important: all of our discussion regarding field directions assumes that we are dealing with conventional current.