Question

An electron (charge= -1.6 x 10^-19


c.is moving at 3 x 10^5 m/s in the positive x direction. a magnetic field of 0.8 t is in the positive z direction. what are the magnitude and direction on the magnetic force on the electron?

Answer 1

Answer:

Prof. Paul Avery Prof. Zongan Qiu Nov. 4, 2014

Exam 2 Solutions

1. The positive terminals of two batteries with emf's of 1 amd 2, respectively, are connected together. Here 2 > 1. The circuit is completed by connecting the negative terminals. If each battery has an internal resistance of r, the rate in watts at which electrical energy is converted to chemical energy in the smaller battery is:

Answer: 2  11 / 2r

Solution: The energy conversion in the smaller battery is  1i . However,  i  2  1 / 2r

because of the arrangement of the batteries, so the total power is 2  11 / 2r .