Question

In Niels Bohr's 1913 model of the hydrogen atom, an electron circles the proton at a distance of 5.29 ✕ 10-11 m with a speed of 2.19 ✕ 106 m/s. Compute the magnitude of the magnetic field that this motion produces at the location of the proton.

T

The L-shaped wire in the previous exercise (for Example 30.1) is now smoothed out with a quarter arc. In other words, the wire runs from y = +∞ to the point (0,b), then joined by a circular arc with radius b (centered at the point P(b,b)), continue on from (b,0) to x = +∞, with b = 0.7m. What is the magnetic field B (magnitude) at the point P(b,b) if the current is 4.0A?

B = T

Decorative only

Answer 1

for the second question I need the reference example from 30.1 which is missing in the question, I have answered the first question, solution below given.