7. Which of the following statements are true statements about electric force? Choose all that apply. a. Electric force is a contact force.
b. A doubling of the quantity of charge on one of the objects results in a doubling of the electric
force.
C. Electric forces between two charged objects increases with increasing quantity of charge on
the objects.
d. Electric forces can only act between charged objects - either like-charged or oppositely-
charged.
e. If object A attracts object B with an electric force, then the attractive force must be mutual -
i. e., object B also attracts object A with the same force.
f. Electric forces between two charged objects increases with increasing separation distance.

The charge on an electron is 1.60218 × 10−19 c and its mass is 9.10939 × 10−31 kg. how strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.5 cm? answer in units of t.

Arowboat passenger uses an oar to push the boat off the dock by exerting a force of 40n for 3.0s. what impulse acts on the boat.

An charge with mass m and charge q is emitted from the origin, (x,y)=(0,0). a large, flat screen is located at x=l. there is a target on the screen at y position y(h), where y(h) > 0. in this problem, you will examine two different ways that the charge might hit the target. ignore gravity in this problem. 1.assume that the charge is emitted with velocity v(0) in the positive x direction. between the origin and the screen, the charge travels through a constant electric field pointing in the positive y direction. what should the magnitude e of the electric field be if the charge is to hit the target on the screen? express your answer in terms of m, q, y(h), v(0), and l. 2.now assume that the charge is emitted with velocity v(0) in the positive y direction. between the origin and the screen, the charge travels through a constant electric field pointing in the positive x direction. what should the magnitude e of the electric field be if the charge is to hit the target on the screen? express your answer in terms of m, q, y(h), v(0), and l.