Magnetic effects of electric currents

  Magnetic field due to a current through a circular loop   To illustrate the magnetic field due to a current through a circular wire, we should take a straight wire and bend it in the form of the circular wire and electric current is passed through them. As we know that magnetic field produced by the current carrying straight conductor depends on the inversely to the distance   from it. Similarly , at every points of a current carrying circular loop of the conductor , the concentric circles represents the magnetic field around it becomes larger and larger as we move from the conductor. A circular wire is made up of large number of the straight wire or conductor. Every arcs of the circles appear like   as a straight line.   every point on the circular wire is carrying current. And it gives rise to the magnetic field appearing as straight lines at the center of the loop. By applying right hand thumb rules ,   it is easy   to check the ev...

                       Right hand thumb rule   Imagine that you are holding the current carrying straight conductor in your right hand in such a way that the thumb points towards the direction of the current. And your fingers which is surroundings the straight conductor points in the directions of the field lines of the magnetic field.   This is called as right hand thumb rule . This is also called as maxwell’s corkscrew rule.  

  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.                ...