A positive charge 60 nC is 15 cm from a negative charge 50 nC. The force on one of these charges due to the other is approximately
a) 2.1x10-3N
b)2.4x10-8N
c) 1.02x10-7N
d)1.2x10-3N
2)Two flat charged conducting plates are parallel to each other and separated by a distance of 1 cm. One has a surface charge density of 2 nC.m-2 and the other carries a surface charge density of -2 nC.m-2. What is the potential difference between the two plates?
a)90V
b)15V
c)2.25V
d)11V
3)Two point charges of 50 nC are each placed at the two vertices of an equilateral triangle of side 2.0 m. Find the magnitude of the net electric field at the third vertex of the triangle.
a)266 N.C-1
b) 97.4N.C-1
c) 168.75 N.C-1
d) 195 N.C-1