# 29 303l magnetic force and field ch29 2 magnetic

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: the direction of B 303L: Magnetic Force and Field (Ch.29) 303L: Magnetic Force and Field (Ch.29) 2 Magnetic Force Ampere’s Law between two parallel conductors describes creation of magnetic fields by current • The current I2 produces magnetic field B2 = µ0 I 2 2πd • The product rr B ⋅ ds on the circular path defined by compass needles: • The wire carrying I1 in magnetic field is subject to force r µ0 I r ∫ B ⋅ ds = B ∫ ds = 2πr (2πr ) = µ I rr r µII F1 = I1 l × B2 = 0 1 2 l 2πd 0 • Parallel conductors carrying currents in the same direction attract each other, and parallel conductors carrying The line integral of currents in opposite directions repel each other rr B ⋅ ds around any closed path equals µ 0 I , where I is the total steady current passing through any surface bounded by the closed path r •When the magnitude of the force per unit length between two long parallel wires that carry r ∫ B ⋅ ds = µ I identical currents and separated by 1 m is 2×10-7 N/m, the current in each wire is 1 A 0 •When a conductor carries a steady current of 1 A, the quantity of charge that flows thr...
View Full Document

## This document was uploaded on 01/15/2014.

Ask a homework question - tutors are online