P29_007 - 7. (a) Equating the magnitude of the electric...

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

View Full Document Right Arrow Icon
7. (a) Equating the magnitude of the electric force ( F = eE ) with that of the magnetic force (Eq. 29-3), we obtain B = E/v sin φ . The Feld is smallest when the sin φ factor is at its largest value; that is, when φ =90 .Now ,w eu se K = 1 2 mv 2 to Fnd the speed: v = r 2 K m e = s 2(2 . 5 × 10 3 eV)(1 . 60 × 10 19 J / eV) 9 . 11 × 10 31 kg =2 . 96 × 10 7 m / s . Thus, B = E v = 10 × 10 3 V / m 2 . 96 × 10 7 m / s =3 . 4 × 10 4
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

Ask a homework question - tutors are online