Recent content by ChloeFoulkes

im going to use the exponential method, only because it rings a bell with something we did in a lecture:) ive now got: 1/4i(e-1+e1)(cos3+isin3-cos(-3)+isin(-3))+1/4i(cos3+isin3+cos(-3)+isin(-3))(e-1-e1) all the trig seems to cancel out? so I am left with 1/4i(e-1+e1)+1/4i(e-1-e1) I...

I get:1/4i(e-1+e1)(e3i-e-3i)+1/4i(e3i+e-3i)(e-1-e1) now would i sum the real and imaginary parts?

Homework Statement Find the real and Imaginary parts of sin(3+i) Homework Equations sin(x+y)= sinxcosy+sinycosx The Attempt at a Solution I think I am right in saying that you use the sine addition formula but then i get stuck from there. Is it something to do with exponential form?

for a) i equalled a/x^2 and kq/x^2 cancelling to give q=a/k. subbing in values i got 6.67x10^-7 C. How would i know which direction the field is pointing?

Homework Statement The electric field on the x-axis due to a point charge fixed at the origin is given by E=(a/x2)i, where a = 6.00 kVm and x is not equal to zero. a) Find the magnitude and sign of the point charge b) Find the potential difference between the points on the x-axis at x=1...

Homework Statement Find the equation of the line, p, that is perpendicular to r=(1,1,1)t + (3,5,2) and passes through (3,3,1) Homework Equations dot product =0 The Attempt at a Solution I understand that the direction vector r and p, when dot producted must =0 but I've forgotten...