Current Electricity-08-Answersheet

1. (d) 2. (b) 3. (c) 4. (c) 5. (c) 6. (c) 7. (b) 8. (a) 9. (c) 10. (d) 11. (b) 12. (b) 13. (b) 14. (b) 15. (d) 1. (d) 2. (d) 3. (c) 4. (a) 5. (a) 6. (c) 7. (b) 8. (a) 9. (c) 10. (a) 11. (d) 12. (c) 13. (b) 14. (b) 15. (d) 1. 17, 8.5V 2. (a) 6 (b) 2V, 4V, 6V 3. 12 V 4. 30 A 5. (a) X = 8.2  ; to minimise reistance of the connection which are not accounted for in the bridge formula (b) 60.5 cm From A (c) The galvanometer will show no current 6. Resistance in series = 5988 . 7. 2.25 V 8. 2.7 104 s (7.5 Hrs) 9. 11 Volt, 9 Volt, 6 Volt 10. (a) 1.4 A, 11.9 V (b) 0.005 A  5 mA 11. (a) (i) in series (ii) all in parallel ; n2 (b) (i) join 1  , 2  in parallel and the combination in series with 3  . (ii) parallel combination of 2  and 3  in series with 1  . (iii) all in series. (iv) all in parallel. (c) (i) 16/3  (ii) 5R 12. 3.7 A 13. (a) The 20K voltmeter gives the highest reading; the last case (both the voltmeters across AB) gives the lowest reading. (b) All cases will give the same reading if internal resistance is zero; otherwise answer is similar to (a). 14. Reading will be same for all times 15. (a) 10  (b) 2  SUBJECTIVE LEVEL - II 1. 7 2. (a) 2/13 V (b) Across G 21/13 V Across H 19/13 V 3. R  t Cln 3  2 4. (a) 4 r 3 r (b) 4 . 5. 0 Amp 6. 4/9 Amp, 2W 7. R  4 (r  r ) 7 1 2 8. r  72 ; E  19V 19 9. Number of time constnat is ln 2 10. 40 V SUBJECTIVE LEVEL - III 1. (a) (c) 32 No change (b) 20 V 2. (i) (iii) 0.5 A 1.7 V (ii) 0.833 A 3. (a) 2 V (b) 6 Amp (c) 1  3 4. Ammeter Voltmeter 5. 11 mA Q 0 k  t e 0 k 7. R   L  W =   0.22 8. (a) 0.9 A (b) 0.00494 A, 1.97 V J  V  rbra  9. (b) r2  r  r   b a   1  VC 10. EC1    2   e PROBLEMS 1. (a) No (b) (c) 8 2. (i) qA  90C, qC  210C and qB  150C (ii) (a) 47.4 mJ. (b) Uf = 18 mJ. 3. 20 V 3

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