I have understood the solution but I am not able to under stand how the encircled equation is derived and through w nich formula

Question

I have understood the solution but I am not able to under stand how the encircled equation is derived and through w nich formula it has come Kindly help teachers will be evergrateful to you Example 5 Strategy Solution A very long thin sheet carries a current i along its length The current is uniformly distributed across its cross section This sheet is bent so as to form a hollow hemi cylindrical surface Find the magnetic field on the axis of this half cylinder Take the radius as R axis The figure shows the cross section of the sheet Consider an arc of length ds which subtends an ido xdS T angle do at the centre The current flowing across the length of this arc is di TR y axis dS Rdo dB is the magnetic field due to the arc then AB Ma dB Hodi 2 R dB Hodi 2nR B dB B B Ho in the direction shown 2n R sinoi cosoj DICE 0 121 0 H i i L R singdai cosode di de do 50000 199 dB dS x axis Onkoch Tower 8 Pusa Road New Delhi 110005 Ph 011 47623456

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