Physics Unit 2 Past Paper

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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.

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Conducting rods o r .

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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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(d)

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

Figure 2 Table I below showssomeof the results obtained. R

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