A long straight wire of radius R carries a current distributed uniformly over its cross-section. The magnitude of the magnetic field is A long straight wire of radius R carries a current distributed uniformly over its cross-section. The magnitude of the magnetic field is November 18, 2021 Category: Cengage NEET by C.P Singh , Chapter 5 - Magnetic Field , Part 2 , Facebook Messenger WhatsApp Share this:TwitterFacebook Related A long straight wire of radius a carries a steady current i. The current is uniformly distributed across its cross section. The ratio of the magnetic field at a/2 and 2a isA long, straight wire of radius a carries a current distributed uniformly over its cross-section. The ratio of the magnetic fields due to the wire at distance a/3 and 2a, respectively from the axis of the wire is :A long straight wire of radius a carries a steady current I. The current is uniformly distributed over its cross-section. The ratio o the magnetic fields B and B′, at radial distances a/2 and 2a respectively, from the axis of the wire is