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Phy 200:Electricity &Amp; Magnetism Question Paper

Phy 200:Electricity &Amp; Magnetism

Course:Computer Science

Institution: Kenya Methodist University question papers

Exam Year:2013

END OF 1ST TRIMESTER 2013 (EVENING) EXAMINATION

FACULTY : COMPUTING & INFORMATICS
DEPARTMENT : CIS & BI
UNIT CODE : PHY 200
UNIT TITLE : ELECTRICITY & MAGNETISM
TIME : 2 HOURS

Instructions: Answer Question ONE and any other TWO Questions.

Question One

(a) State FOUR properties of electric lines of force. (4 Marks)

(b) Explain the application of Ohm’s law in electric circuits. (3 Marks)

(c) With a suitable circuits describe the process of charging and discharging a capacitor. (4 Marks)

(d) State and explain Coumb’s law of electrostates. (4 Marks)

(e) If THREE resistors which are 4 , 10 and 20 respectively are connected in series, find the equivalent resistance. (3 Marks

(f) Describe the Fleming’s Right-hard rule as used in electromagnetic induction. (3 Marks)

(g) With a suitable diagram explain the components of a magnetic circuit.
(3 Marks)
(h) State the two laws of magnetic force. (2 Marks)
(i) Determine the potential difference across the 2 f capacitor in the circuit shown. (4 Marks)

3 f

6 f 2 f

3 f

+ 70V -

Question Two

(a) Define an electric field? (2 Marks)

(b) For the following changes draw the electric fields around them.

(i) (ii) (iii) (3 Marks)

(c) State and explain superposition theory as used in the networks.
(5 Marks)

(d) Use nodal Analysis to find current in the different branches of the circuit shown in figure 2.1 (10 Marks)
Fig 2.1
2 3 1
M N

6v
12v 1 5

Question Three

(a) State FOUR properties of magnetic lines of force. (4 Marks)

(b) For capacitor connected in parallel show that the total capacitors can be treated like resistors connected in series. (4 Marks)

(c) Explain Coumb’s law as used in electrostates. (4 Marks)

(d) Calculate the capacitance of two metal plates area 30m2 and separated by a dielectric 2mm thick and relative permittivity of 6. If the electric field strength in the dielectric is 1000v, calculate the total charge on each plate. (8 Marks)
Question Four

(a) Explain the advantages of connecting electrical appliances in parallel as compared to series. (4 Marks)

(b) What are the advantages of AC power over DC power. (3 Marks)

(c) Define the following terms used in magnetism. (3 Marks)

(i) diamagnets
(ii) paramagnets
(iii) ferromagnets
(d) A capacitor of capacity 75.2 f is connected in series with a non-inductive resistance of 30 across a 100v, set. 50 Hz supply. Determine;
(i) The impendence and total current
(ii) The phase angle
(10 Marks)

Phy 200:Electricity &Amp; Magnetism Question Paper

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