# Physics Unit 2 Past Paper

Topics: Trigraph, Harvard Mark I, Photon Pages: 13 (1309 words) Published: January 21, 2011
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-4(a)

2.

Define EACH of rhe following terms: (i) Magneticflux:

[1 mark ] (ii) Tesla:

[1 mark ] (b) State (i) Faraday'sLaw

[1 mark ] (ii) Lenz's Law.

[1 mark ]

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-5(c)

Two conductingrods arejoined at right anglesto eachother as shown Conducting bar

in Figure l.

o

Conducting rods o r .

.

Figure I

A conducting bar in contact with the rods startsat the vertex and moves with a consrant velocity (v) of 4-20m s-r arongthemas shown. A magnetic field of magnitude 0.450 T is directedperpendicularlyour of the page. Find the (i) area of the triangle which is formed at 2 seconds by the conducting bar and conducting rods

[2 marks] (ii) magnetic flux through the triangle at seconds

[2 marks] (iii) electromoriveforce (e.m.f.)inducedin rhe moving rod at 2 seconds.

[2 marksl Total l0 marks

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-6-

3.

(a)

Write an expression for the total resistance, Rr, of three resistors Rt, Rz and R3, in parallel.

[1 mark I (b) StateOhm's Law.

ll mark I (c) force (e.m.f.)andthe terminalpotential Explain thedifferencebetweenthe electromotive (p.d.) of a battery. difference

[2 marks]

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- 7-

(d)

A set of measurements were made using the circuit of Figure2.

Figure 2 Table I below showssomeof the results obtained. R

v
0

I

0 300a
oo

O.1A 5

r0v

Thble I Fill in the blank spaces rhe tabrewith the missing data. in

[6 marks] Total 10 marks

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8 -

4.

(a)

Explain what is meant by EACH of the following: (i) P-type semiconductor

lL mark I
(ii) N-rype semiconductor

[1 mark I
t iii) D o p i n g , a s a p p l i e d to s emi conducl ors

[1 mark ] (iv) Depletion region

[1 mark ] O) SuggestONE application a p-n junction diode. of

[1 mark

]

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-9(c)

Figure3 showsa combination two silicon diodesin a circuit. of 1000 o

vo

2.0 -r v
I

-1- z.o v

Figure 3 The characteristic - v curve for the diodesis shown in Figure 4. I

uAz.s
2.0 1.5 1.0 0.5 0 0 0.2

vlv

(i)

Calculate the a) Vi=

voltage, 7r, when

[2 marksJ b)

Vr = - 10-0V.

[1,mark ]

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-10-

(ii)

Sketchthe outputwhen V, = 10 Sin 0)t, wherec0 = 100 rad s-1, including appropriate numericalvalueson the scales.

[2 marks] Total 10 marks

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5.

(a)

In the spaceprovided below sketch a typical gain frequency curve for an operational amplifier.

[3 marks] (b) What is meantby a 'virtual earth' rn an operationalamplifier circuit?

[1 mark ] (c) StateONE effectof positivefeedbackin an operational arnplifiercircuit.

[1 mark ]

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.1,2(d)

Figure shows cascade 5 a amplifier circuit100kfi

500ko

Figure 5
Calculate the (i) net gain of the circuit

[4 marks] (ii) outputvoltage,Vr, when Vi = 0.01,V.

[1 mark ] Total 10 marks

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136.
(a)

(i)

Arithmetic operations usuallyperformedby adders. A half are addercircuit is usedto add the l's columnin binary addition. Write the truth tablefor a half-adder.

[2 marksl

(ii)

You are provided with an Exclusive-OR (EX-OR) gate and an AND gate...

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