JEE Main 202529 Jan, Morning shiftPhysicsMediumMagnetic Effects of Current and Magnetism165× since 2002
Consider a long straight wire of a circular cross-section (radius ) carrying a steady current . The current is uniformly distributed across this cross-section. The distances from the centre of the wire's cross-section at which the magnetic field [inside the wire, outside the wire] is half of the maximum possible magnetic field, any where due to the wire, will be