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# 71. Magnetic field at the centre of a circular coil of radius R carrying current i is Boc – and its direction R is given by right-hand thumb rule. Magnetic field at the centre of a circular arc subtending an angle ( 0 ) 0 (in degree) is Bo and its direction can be found using right hand rule. R (360°) R13609 Consider two circular coils made of uniform conductors as shown in figure 3 and 4. In figure 3 points C and D are diametrically opposite to each other, and in figure 4 ZPO2Q = 120°. Then magnetic fields 1. At both O, and O2 are zero 3. is zero at O, but non-zero at O2 (1) 2. At both O, and O2 are non-zero 4. is non-zero at O, but zero at Oz.

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