InterviewSolution
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InterviewSolution
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Explain an activity to show that a current-carrying conductor experiences a force when placed in a magnetic field. |
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Answer» Solution :A CURRENT-carrying conductor experiences a magnetic force due to a magnetic FIELD. The force is maximum when the conductor is placed perpendicular to the direction of magnetic field. To demonstrate the force we perform the following experiment: Experiment: Take a small sized aluminium rod AB of length about 5 cm. Suspend the rod AB horizontally from a rigid stand using two connecting wires. Place a STRONG horse-shoe magnet NS in such a WAY that the rod AB LIES between the poles of the magnet. Let the north pole N of magnet lies below the rod and the south pole S lies above the rod as shown in Fig. 13.27. Thus, a magnetic field directed in vertically upward direction is present.  Completetheelectrical circuit ofaluminium rod AB byconnectingit in series witha battery , KeyK anda variableresistance . Put thein key Kso that an eletric currentbegins to flow through the aluminium rod from end B to end A . We observe thaton passingcurrentthe rod AB is displaced towards the left . It showns thatthe aluminium rodis experiencinga mechanical force due towhich it is beingdeflected . Directionofdeflectionis given byFleming.s left handrule . Effect of change in directionof current: Reverse the connections of batteryso that on applyingplugin Key K , currentflows , in thealuminium rod from A to B. We now find the rod AB isdeflectedtoward the right. Thu s, by reversingthe direction of current , direction of force is also reversed . It is accordancewith Fleming.s left- handrule . Effect of changein direction of magneticfield : Now reverse the direction of magnetic fieldtoverticallydownward direction. For thispurposesuspend, the horse - shoe magnet in such a way that N-poleof magnet lies abovethealuminium rod AB and S-poleof magnet lies belowthe rod . It nowcurrentinaluminium rod is flowingfromA to B , thenthe rodis flowing fromA to B , thenthe rodis deflected towards let . It showthat directionof deflection(or thedirectionof force) is reversed on reversingthedirectionof magneticfield . |
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