An electron and a proton are each moving at 785 km/s in perpendicular paths as shown in figure 1

FIGURE 1:https://session.masteringphysics.com...1/YF-28-08.jpg

a.) At the instant when they are at the positions shown, find the magnitude of the total magnetic field they produce at the origin.

b.) Find the direction of the total magnetic field they produce at the origin.

c.) Find the magnitude of the magnetic field the electron produces at the location of the proton.

d.) Find the direction of the magnetic field the electron produces at the location of the proton.

e.) Find the magnitude of the total magnetic force that the electron exerts on the proton.

f.) Find the direction of the total magnetic force that the electron exerts on the proton.

g.) Find the magnitude of the total electrical force that the electron exerts on the proton.

h.) Find the direction of the total electrical force that the electron exerts on the proton.

This is a lot btw, can someone help if possible because even I got the first part wrong and need fixing of it too.

Thanks.

:My Attempt on Part A

I attempted the first part after searching up online for similar questions, using the relevant formulae from a similar question in this link: https://i.imgur.com/vRRwJ4y.png

Using

q=1.6x10-19

v=785x10^3 m/s

mew(o)=4*pi(x10^-7)

r1=4x10^-9 m

r2=5x10^-9m

https://i.imgur.com/MjR2IQ3.jpg

https://i.imgur.com/sue8SAQ.jpg

But somehow I'm getting it wrong when I put in my calculated value after checking twice or so:

First being -5.652x10^12

Then my second attempt when changing signs in the workings, -1.801x10^-12 is wrong too.

Proof: https://i.imgur.com/VgH0lJ4.png

CORRECTION:I forgot to square the radii or respective radius but unsure if it's correct.

Proof: https://i.imgur.com/uKmoEhy.jpg

https://i.imgur.com/gmeVYTb.jpg

Somehow I did them seperately too to be sure but I'm getting different values for seperately or when I use the formula for them both as shown.

So feel free to help me out btw! But not just for part a since it carries on and I'm unsure where to go. Thanks.