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Chapter 10
                    1. (b)             2. (d)           3.   (c)          4. (c)
                    5. (i) –0.18 m;    (ii) +0.67 m
                    6. Concave lens; –1.25 D
                    7. Convex lens; +3.0 D

                   Chapter 11
                    1. (d)             2.  (b)          3.  (d)           4.  (c)
                    5. Parallel        6. 122.7 m; ¼ times
                    7. 3.33 Ω          8. 4.8 kΩ        9. 0.67 A
                   10. 4 resistors     12. 110 bulbs
                   13. 9.2 A, 4.6 A, 18.3 A
                   14. (i) 8 W;        (ii) 8 W
                   15. 0.73 A
                   16. 250 W TV set in 1 hour
                   17. 1100 W
                   18. (b) High resistivity of alloys
                        (d) inversely.


                   Chapter 12
                    1. (d)             2. (c)

                    3. (a) True       (b) False
                    6. vertically downwards

                    7. (i) Right-hand thumb rule, (ii) Fleming’s left-hand rule

                   Chapter 13
                    1. (a), (c), (d)   2.   (b)         3.   (d)


































                 Answers                                                                                  219


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