PhysHL P2 M06 TZ1 M - 13(f(i M06/4/PHYSI/HP2/ENG/TZ1/XX/M...

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– 13 – M06/4/PHYSI/HP2/ENG/TZ1/XX/M+ (f) (i) 2 V P R = ; 22 240 110 240 110 R R = ; 2 110 240 110 240 R R ⎛⎞ = ⎜⎟ ⎝⎠ ; 0.21 = Or from P VI = 21 11 240 110 to give 24 I II I == ; 1 1 I RI R = ; 2 2 12 2 11 24 ; 0.21 = [3] (ii) to get equivalent power, heating elements must have lower resistance; therefore, they have to be physically larger so more expensive / take up more space; Or smaller voltage supply needs larger current; so thicker cables therefore, more expensive / take up more space; [2]
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– 14 – M06/4/PHYSI/HP2/ENG/TZ1/XX/M+ B2. (a) (i) showing connection via brushes, [1] (ii) two correct forces; [1] (iii) when the split ring is in contact with the brushes the current in the coil will always be in the same direction / OWTTE ; some statement to the effect that this will be so even after the coil has rotated through 180 D and sides of coil are reversed; when the split ring is not in contact with the brushes, the momentum of the coil will keep it rotating / OWTTE ; [3] (b) (i) tension in thread weight of object tension in thread; weight (of object) / mg; tension length > weight length; [3] (ii) 2 2 s a t = ; 2 2 2 0.84 0.35ms (2.2) × == ; Tm gm a = ; ( ) 0.015 10.35 0.16N ga =+ = × = ; [4]
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– 15 – M06/4/PHYSI/HP2/ENG/TZ1/XX/M+ (c) (i) measure the time it takes the object to go successive distances of say 10 cm / any realistic length given or implied; if the times are equal then speed is constant / OWTTE ; [2] (ii) increase in potential energy 0.015 10 0.84 0.13J = ×× = ; rate of working = power input 0.13 0.037 W 3.4 == ; [2] (iii) power input to motor 6.0 0.045 0.27 W VI × = ; 0.037 0.14 0.27 out in P Eff P = or 14% ; [2] (d) lg( ) E against lg( ) I ; lg( ) lg( ) lg( ) E knI =+ ; slope/gradient n = ; [3] (e) (i) a magnetic flux links the coil; as the coil rotates the flux linkage changes with time; therefore, from Faraday’s law an e.m.f. will be induced; [3] (ii) the faster the speed of rotation, the greater the flux change; Faraday’s law states that the e.m.f. is equal/proportional to the rate of change of flux; [2] (iii) the amount of flux linking the coil changes with the angle that the coil makes with the magnetic field / OWTTE; [1] (f) (i) any maximum/minimum value of V ; [1] (ii) from the graph 0 2.0V V = ; therefore, 0 rms 1.4V 2 V V ; [2]
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This note was uploaded on 11/06/2010 for the course ENGLISH 121 taught by Professor Padowski during the Spring '10 term at Bronx High School of Science.

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PhysHL P2 M06 TZ1 M - 13(f(i M06/4/PHYSI/HP2/ENG/TZ1/XX/M...

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