Sphere A is placed 12 cm away from another charged sphere, B, along a straight line in a vacuum, as shown below. Sphere B carries a charge
of +0,8 pc. Point P is located 9 cm to the right of sphere A.
12 cm
+ 0,8 με
P
-0,75 C
A:
B
9 cm
(5)
7.2.2
Calculate the magnitude of the net electric field at point P.​

Anybody wanna ? (picture included? )

Which of the following is not a physical property of mattera. melting pointb. heat of combustionc. viscosityd. boiling point

Cyclotrons are widely used in nuclear medicine for producing short-lived radioactive isotopes. these cyclotrons typically accelerate h- (the hydride ion, which has one proton and two electrons) to an energy of 5 mev to 20 mev. this ion has a mass very close to that of a proton because the electron mass is negligible—about 1 2000 of the proton’s mass. a typical magnetic field in such cyclotrons is 1.9 t. (a) what is the speed of a 5.0-mev h-? (b) if the h- has energy 5.0 mev and b = 1.9 t, what is the radius of this ion’s circular orbit?