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  1. S

    Physics: Post your doubts here!

    Sketch graph with labelled axes to show how current through the wire will vary with p.d. across it if temperature increases as current increases.Can anybody help me out please
  2. S

    Physics: Post your doubts here!

    Yea me too i think the answer is A as constant speed implies that acce=0 therefore 0=driving force i.e F _ opposing force i.e f therefore f=F. Can anybody confirm please
  3. S

    Physics: Post your doubts here!

    Help please! :' I can not understand what happens when cells in a battery are wrongly connected like in the following 2 questions.Thanks in advance guys :) Question 1 ) Five cells of emf E are connected in series each having internal resistance r. if due to oversight, one cell is connected...
  4. S

    Physics: Post your doubts here!

    Thanks :) I totally understand it now
  5. S

    Physics: Post your doubts here!

    When strain is increased,it implies that length decreases according to strain=extension/length when length decreases,resistance also decrease according resistance=resistivityXlength/area,right? Then how come the answer is E?Maybe i can't understand the question itself.Help please!! Thanks in...
  6. S

    Physics: Post your doubts here!

    Can someone explain this to me please ''For the greatest efficiency the external resistance must be much greater than the internal resistance of the cell. However, for the maximum power to be delivered to the external circuit the internal resistance must be equal to the resistance of the...
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