ELECTROSTATICS
CAPE: UNIT 2 MODULE 1
1.
Calculate the potential at the centre of the shape below.
Q1
r
r
A
Q2
r
r
Q3
Assume: Q1 = 1.0x10-8C, Q2 = -3.0x10-8C, Q3 = 5.0x10-8C, r = 2.0m
2.
[6 Marks]
Calculate the Electric field strength at points A, B, and C for the arrangement below.
C
8m
8m
A
Q1
2m
B
Q2
6m
8m
Q1 = 1.6x10-7C, Q2 = -1.6x10-7C
[6 Marks]
3.
What is the electric potential at the surface of a silver nucleus. The radius is 6.6x10-15m and the
atomic number 'Z' is 47. (Assume the nucleus is spherical and behaves electrically for external
points as a point charge).
[4 Marks]
4.
Calculate the electric field strength at a point 4.5x10-5m from a proton. If this is the separation
of two protons in an Iron nucleus, what is the force of repulsion between them. Q= 1.6x10-9C,
ε0= 8.85x10-12C2N-1m-2
[4 Marks]