question_answer

  (a) On what factors, the resistance of the conductor depends? (b) What is (i) the highest, (ii) the lowest resistors that can be secured by combinations of four coils of resistance

Answer:

  (a) Resistance of a conductor depends on the following factors (i) Resistance of a conductor is directly proportional of the length of the conductor     (1/2) (ii) Resistance of a conductor is inversely proportional to the area of cross-section.                                                                                                                                                                   (1) (b) (i) The overall resistance is increased in a series combination.  Highest equivalent resistance                                                                                                                                                   (1) (ii) The overall resistance is reduced in a parallel combination.  Lowest equivalent resistance     24                                                                                                                                                                                                       (1)