Thank you Does Arightarrow times B point into or out of the page? If both vector

Question

Thank you

Does Arightarrow times B point into or out of the page? If both vectors Arightarrow and B have the same magnitude, which cross product Arightarrow times B has greater magnitude? As shown below, a positive charge, QO, of +4 muC is attracted by charges QA and QB with a total Coulomb's force of 240 N. What is the charge on QA and QB? Three positive point charges, each with q = 3 nC, are located at the comers of a triangle in the x-y plane, with one corner at the origin, another at (2 cm, 0, 0), and the third at (0, 2 cm, 0). Find the electric fields, Erightarrow, at the origin. Hint: Watch your units!

Explanation / Answer

1a)out of the page!!

b) 1st cross product will have greater magnitude as sin90 is maximum =1

2a)2Fcos30=240N

F=138.56N

q1*qA/(epsilon*r^2)=138.56

qA=138.46*(0.02)^2*(epsilon)/(4*10^-6)=0.123uC

3) Frankly speaking unable to figure out!!!

thank you.

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