PHYSICS - Trial Paper Collection

papercollectionNO12(a) (i)(ii)(b)11MARKING CRITERIAState Lenz’s Law correctly- The direction of the induced current is such as to oppose thechange causing it.State the explanation correctly- The solenoid experiences a change in the magnetic flux/magneticfield (lines)- According to Faraday’s Law of electromagnetic induction- An e.m.f. is induced in the coil- X is north poleState the suitable number of turns of coil in the generator andreason correctly- High number of turns of coil- Larger force acting on the coil / higher electromagnetic fieldstrengthState the suitable strength of the magnets in the generator andreason correctly- High strength magnets- Larger force acting on the coilState the suitable arrangement of components in therectification circuit- Using 4 diodes and a capacitor- 4 diodes to produce full-wave rectification and capacitor as asmootherState the suitable capacitance of the capacitor in therectification circuit- Large capacitance- To produce a constant output voltageState most suitable choice of generator and justificationcorrectly- Y and high number of turns of coil and high strength of magnetsState most suitable choice rectification circuit and justificationcorrectly- C, 4 diodes and a capacitor with high capacitanceMARKSUB TOTAL111111+11+11+11+111(c) (i) State the type of transformer correctly- Step-down transformer(ii) Correct substitution 1(240)(150)12Correct answer and no unit 13000(iii) Correct substitution241´ 100(0.125)(240)Correct answer with unit 180% // 0.8 5201