An infinitely long conductor PQR is bent to form a right angle as shown. A current I flows through PQR The magnetic field due to this current at the point M is H 1 . Now another infinitely long straight conductor QS is connected at Q so that the current is I/2 in QR as well as in QS, The current in PQ remaining unchanged. The magnetic field at M is now 
The ratio 
is given by
Text Solution
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Magnetic field at any point lying on the current-carrying straight conductor is zero.
Here, 
magnetic field at 
due to current in 
.
magnetic field at 
due to 
magnetic field at 
due to 
magnetic field at 
due to 
.
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