A)Using Biot-Savart Law,obtain an expression for the magnetic field along the axis of a current loop. B)In the Bohr model of hydrogen atom, the electron follows a circular orbit centred on the nucleus containing a proton. The motion of the electron along the circular orbit constitutes a current. Calculate the magnetic field produced by the orbiting electron at the site of the proton. C)A fuse in an electric circuit is designed to open the circuit like a switch when the current exceeds a preset value. If a fuse is made of material that melts when the current density reaches 400 A cm^2, what is the diameter of the wire needed to limit the current to 0.30 A?
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