Download Ch1electricForce

Electrical forces
k = 8.99E 9 Nm2/C2
e = 1.6E-19 C
1. How much force is exerted between two charged objects that are separated by a
distance of 1.5 meters if both objects have a charge of +3 C.
2. Deuterium atoms contain one proton and one neutron in the nucleus with one
electron orbiting at a distance of 5.1E-11 m. The masses of the particles are as
follows: electron  9.11E-31 kg, proton  1.67E-27 kg, neutron  1.67E-27 kg.
a. Calculate the magnitude of the gravitational force of attraction between
the nucleus and the electron (G =6.67 E –11 Nm2/kg2).
b. Calculate the magnitude of the electrical force of attraction between the
nucleus and the electron.
3. A metal sphere has a net charge of –4C. How many excess electrons does the
metal sphere contain?
4. What is the total charge of 1 g of electrons?
5. An  particle (helium nucleus, 2 protons and 2 neutrons) is placed between two
stationary, charge objects. It is 0.0030 meters to the right of the object carrying a
+1.0 E-12 C charge and 0.0020 meters to the left of an object carrying a -2.0 E-12
C charge.
+1E-12C
-2E-12C

0.0030m
0.0020m
a. What is the net magnitude and direction of the electrical force acting on
the  particle?
b. At what rate and in what direction will the  particle accelerate?