Light of wavelength 675 nvm passes through a double slit, and makes its first minimum (m=1) at an angle of 0.111 deg. What is the separation of the slits, d, in MILLIMETERS? (remember, milli means 10^-3)

Point charges q1 = 51 µc and q2 = −27 µc are placed 1.0 m apart, with q2 on the right. what is the force (in n) on a third charge q3 = 19 µc placed midway between q1 and q2? (assume the positive direction is to the right. indicate the direction with the sign of your answer.)