1.

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 H1. 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 H2.The ratio H1/H2 is given byA) 12  B)  1  C)  23  D)  2

Answer»

Correct Answer: C  

Explanation : Magnetic field at any point lying on the current carrying straight conductor is zero. 

Here H1 = Magnetic field at M due to current in PQ.         

H2 = Magnetic field at M due to QR + magnetic field at M due to QS + magnetic field at M due to PQ =0+H1/2+H1= 3/2 H1 

H1/H2 = 2/3



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