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Magnetic field due to current carrying strip

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Question 1: State whether a magnetic field is associated or not around i a static charge, ii a moving charge; iii current carrying conductor. Answer: i A static charge is not associated with a magnetic field around it. Question 2: What is the nature of the lines of force of the magnetic field due to a straight current carrying wire? Answer: The lines of force, in this case, are concentric circles centered on the wire. Question 3: What will happen to a compass needle when the compass is placed below a wire and a current is made to flow through the wire?
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Magnetic field at a point above a metal strip. | Physics Forums

In , E. Hall devised an experiment that can be used to identify the sign of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative. Visit this website to find more information about the Hall effect. We investigate the Hall effect by studying the motion of the free electrons along a metallic strip of width l in a constant magnetic field Figure.
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Physics equations/Magnetic field calculations

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We all know that magnetic field is produced by the motion of electric charges or electric current. Biot-Savart law gives this relation between current and magnetic field. It relates the magnetic field to the magnitude, direction, length, and proximity of the electric current. A small current carrying conductor of length dl, carrying a current I is an elementary source of magnetic field.
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