Question

A thin lens has a focal length f = 1.0 x 10^2 cm. In order to ensure that the image is the same size as the object, where should the object be placed? That is, what is the object distance s?

Question 1 options:

	1.0 x 10^2 cm
	3.4 x 10^2 cm
	50. cm
	2.0 x 10^2 cm
	4.0 x 10^2 cm

An electron is moving in the positive x direction at a rate 3.0 x 10^5 m/s. A magnetic field persists in the space pointing in the positive z direction with a magnitude 0.80 T. What is the magnetic force on the electron (recall its charge is -1.60 x 10^-19 C):

Question 3 options:

	4.0 x 10^-14 N, pointing in the positive y direction
	4.0 x 10^-14 N, pointing in the positive z direction
	4.0 x 10^-14 N, pointing in the negative y direction
	4.0 x 10^-14 N, pointing in the negative z direction
	none of these

We have two small charges. The first is +8.0 nano C and the second is -2.0 nano C.   The two are separated by a distance 4.0 m. The electric field in units of N/c at the midpoint between the two charges is:

Question 6 options:

	23
	3.6 x 10^-9
	1.4 x 10^5
	9.0 x 10^9
	1.4 x 10^4

Answer 1