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Solution


Q.

Read the passage carefully and answer the following questions from (i) to (v)

The graph below is a V-I graph of a metallic circuit drawn at two different temperatures T subscript 1 space a n d space T subscript 2

(iv) What is likely to happen if current in a wire is passed for a longer time than required
1 The wire may get burnt and may melt.  
2 Length of the wire may decrease resulting in lower resistance.  
3 Resistance of wire will drop as it will be very difficult to stop the electrons.  
4 Resistance of the wire will get increased due to joule’s heating effect.  

Ans.

(4)