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  Magnetic field due to current carrying conductor   To find the magnetic field in the current carrying conductor , we should Take a long straight copper wire, and battery or cell (two or three cells of having 1.5 volts) and one plug key . Now connect them in the form of series connection of the circuit.    And now put the compass needle parallel to the straight   copper wire. Now, when the circuit is completed , we found that there is deflection of the north pole of the needle of the compass. When the current is passed from north to south , then the north pole of the needle get defected towards to the east direction. But when the direction of the current flowing through the copper wire is changed , then there is change of the direction of the deflection of the needle of the compass. We found that needle moves in opposite direction that is towards the west directions. Then it means that the direction of the magnetic field produces by the electric current...

              Magnetic effects of electric currents       Why does a compass needle gets deflected when brought near a current carrying conductor? A compass needle gets deflected when brought near a current carrying conductor because an electric current carrying wire produce magnetic field around it. We can illustrate this with the such example We take a straight copper wire and place this copper wire between the points (X and Y). in the electric circuit. The wire is kept perpendicular to the plane of the paper. Also a compass is kept near horizontally to the copper wire. And when circuit is completed , then current is passed through this circuit. And found that compass needle gets deflected. It means to say that there is magnetic field produced when electric current is passing through the copper wire.                ...