PreQuiz 16-17.2 .:. Go Up

Vector Fields

Each grid line is a meter. Charge A is +12.4 x 10^-6 C, and charge B is -36.1 x 10^-6 C.  Find the electric field at the origin. Draw the vector as an arrow with its tail on the origin, and label the angle you calculated.  Carry at least 4 sig figs for your calculations.

Fill this in:

	magnitude	trig. angle (opt)	x	y
EA	=Kg/r^2 =(8.99E9)(12.3E-6) /√(5^2+4^2) =2718.93	=270+tan^-1(5/4) =321.34 (Since A is positive, the E field is away from it)	=Mag(cosӨ) =2718.93(cos 321.34) =2123.13	=Mag(sinӨ) =2718.93(sin 321.34) = -1698.5
EB	=Kg/r^2 =(8.99E9)(36.1E-6) /√(4^2+3^2) = 12981.56	=tan^-1(3/4) =36.87 (Since B is negative, the E field is toward it)	=Mag(cosӨ) =12981.56(cos 36.87) =10385.23	=Mag(sinӨ) =12981.56(sin 36.87) =7788.94
		EA + EB	12508.37	6090.45
			Magnitude	Trig Angle
			=√(12508.37^2+6090.45^2) =13912.32 N/C	=tan^-1(12508.37/6090.45)) =25.96 degrees

                                                                                                                        Completed by Sarah Smurthwaite