a. At time t2 = 1 ns, what is the magnitude and direction of the electric field at point A?

b. At what time t3 will the electric field at location A change?

c. What is the direction of the radiative electric field at location A at time t3?

d. What is the magnitude of this radiative electric field?

e. Just after time t3, what is the direction of the magnetic force on a positive charge that was initially at rest at location A? Explain with a diagram.

I need equations for (a) and (b) at least. Thanks.