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ICSE Class 9 Answered

Current is passed from South to north through a conductor placed below a freely pivoted magnetic needle

a)To which direction will the north pole of the magnetic needle turn?

b)Which is the rule used to arrive at this inference?

Asked by Safiyasaju916 | 13 Mar, 2019, 07:10: AM
Expert Answer
    If we Place a straight current carrying wire (the direction of the flow of current is from south to north) such that the
wire is placed below a compass needle and the wire is parallel to the compass needle,then the north pole of the compass needle
deflects towards the east. This is illustrated in figure.
 
Rule used to arrive the inference :

A convenient way of finding the direction of magnetic field associated with a current-carrying conductor is  using right-hand thumb rule.
This rule is explained as follows
 
Imagine that you are holding a current-carrying straight conductor in your right hand such that the thumb points towards
the direction of current. Then your fingers will wrap around the conductor in the direction of the field lines of the magnetic field, as
shown in Figure. 
 
As per this rule , above the wire,  magnetic field lines are emerging out of plane of figue. Hence magnetic field direction is from west to east. 

Once we know the magnetic field direction surrounding the wire, we can determine the deflection direction of compass needle because 
we know that north pole of magnetic needle of compass will align in the direction of magnetic field
Answered by Thiyagarajan K | 13 Mar, 2019, 10:41: AM
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