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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > The magnetic field at the centre of a circular coil of radius r is π time that due to a long straight wire at a distance r from it for equal currents. The following figure show three cases. In all cases the circular part has radius r and straight ones are infinitely long. For same current, the B field at the centre P in cases 1, 2, 3, has the ratio

The magnetic field at the centre of a circular coil of radius r is π time that due to a long straight wire at a distance r from it for equal currents. The following figure show three cases. In all cases the circular part has radius r and straight ones are infinitely long. For same current, the B field at the centre P in cases 1, 2, 3, has the ratio

Find the magnetic field at o. The current-carrying wire loop in Fig (a) lies all in one plane and consists of a semicle of radius 10.0 cm