PLEASE HELP ME!!! :) Consider the long, straight, current-carrying wires shown b

Question

PLEASE HELP ME!!! :)

Consider the long, straight, current-carrying wires shown below. One wire carries a current of 7.7 A in the + y direction; the other wire carries a current of 4.5 A in the positive x direction.

(a) Conceptually: At which of the two labelled points do you expect the magnitude of the net magnetic field to be greater?
---Select---

(b) Calculate: What is the net magnetic field at each of these points?

at point A:

size: ??? ?T,

dir: ---Select---

at point B:

size: ??????T,

dir: ---Select---

(c) What force would be felt by a proton placed at point B at rest?

size: ????N,

dir: ---Select---

(d) What force would be felt by a proton when passing through point A at 20 m/s in the +y dir?

size: ????N,

dir:---Select---

Explanation / Answer

a) atA since maagnetic field from both is out of the page

b) at A: B = B1 + B2 = u0 (I1+ I2)/2 pi r =

= 2.0E-7*(7.7+4.5)/(.16)= 1.53E-5 T or 15.3 uT

out of page or +z dir

at B: B = B1 - B2 = 2.0E-7*(7.7-4.5)/(.16)= 4.0E-6 T or 4.0 uT

into page page or - z dir

c) at rest so F = 0

d) F = q v B = 1.6E-19*20*15.3E-6= 4.896E-23 N

+x dir

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