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Electricity Magnetism &Amp; Modern Physics Question Paper

Electricity Magnetism &Amp; Modern Physics

Course:Certificate In Pre-Tech Physics (Pre-Tech Physics)

Institution: Kabarak University question papers

Exam Year:2009

KABARAK
UNIVERSITY

UNIVERSITY EXAMINATIONS
2008/2009 ACADEMIC YEAR
FOR THE CERTIFICATE OF PRE- UNIVERSITY
PHYSICS
COURSE CODE: PPHYS 011
COURSE TITLE: ELECTRICITY MAGNETISM &
MODERN PHYSICS
STREAM:
SEMESTER ONE
DAY:

TUESDAY
TIME:

9.00 – 11.00 A.M.
DATE:

04/08/2009

INSTRUCTIONS:
1. Answer Question ONE and any other TWO questions.
2. Question ONE carries 40 marks and the other questions carry 15 marks each.
3. You may need the following constants:
i. charge of an electron/proton = 1.6 x 10-19C
ii. k = 9 x 109N.m2/C2
iii. µ0 = 4p x 10-7 T.m/A
iv. h = 6.63 x 10-34 J.s
v. e0 = 8.85 x 10 -12 C2/Nm2

PLEASE TURN OVER
Page 1 of 3

Question ONE (40 Marks)

a) What is the net charge of a collection of 10 electrons?
(3 marks)
b) Which of the following statements is true?
i. a current on a conductor causes a magnetic field
ii. a magnetic field around a conductor causes a current on the conductor
iii. both statements are true
(6 marks)
c) Briefly describe the ways in which excess charge is distributed on a charged
conductor.
(4 marks)
d) Briefly describe how the electric field around a charged conductor is distributed.
(4 marks)
e) An electron and a proton are separated by a distance of 2 x 10-6m. Calculate the
magnitude of the force on the electron.
(4 marks)
f) If a capacitor of 2 x 10-6 F is connected to a battery of 12 V, calculate the charge
flowing through the battery.
(3 marks)
g) Calculate the total resistance of the arrangement below.

(5 marks)
h) A fridge of resistance 10 ? is connected to a 220 V voltage source. What is the
power consumed by the fridge?
(3 marks)
i) In your opinion, is it possible to have a finite length magnet consisting of only one
pole? Briefly explain why or how?
(4 marks)
j) What do you understand by the term wave-particle duality of matter?
(4 marks)

Question TWO (15 marks)

a) A parallel plate capacitor has a plate area of 0.5 m2 and a plate separation of 2 x
10-3 m. Calculate the capacitance of the capacitor.
(3 marks)

Page 2 of 3

b) Draw the magnetic field lines around the magnets in the arrangement below.

S

N
S

N
(12 marks)

Question THREE (15 marks)

a) Which of the following statements is true?
i. a current on a loop inside a magnetic field causes a rotating force on the
loop
ii. rotation of a conducting loop in a magnetic field causes a current to flow in
the loop
iii. both statements are true
(6 marks)
b) If a neutral atom has atomic number 15, what is its electronic configuration?
(3 marks)
c) How many energy shells and how many valence electrons does the atom above
have?
(6 marks)

Question FOUR (15 marks)

a) Calculate the total capacitance of the capacitors in the circuit below.

(7 marks)

b) Draw the relative energy band diagrams of i) and insulator, ii) a semiconductor
and iii) a conductor.
(8 marks)

Page 3 of 3

Electricity Magnetism &Amp; Modern Physics Question Paper

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