A wire is cut into three equal parts and then connected in parallel with the same source. How will its 
(¡) resistance and resistivity gets affected? 
(¡¡)how would the total current and the current through the parts change? 

Asked by pdcavita | 26th Nov, 2017, 09:47: PM

Expert Answer:

resistance is directly proportional to the length of the wire
 
equal part will have equal resistance
 
fraction numerator 1 over denominator R e f f end fraction equals 1 over R plus 1 over R plus 1 over R

fraction numerator begin display style 1 end style over denominator begin display style R e f f end style end fraction equals 3 over R

R e f f equals R over 3 space o h m s
 
current is inversely proportional to the resistance
 
since there are equal resistances in parallel. Equal amount of current will flow through each part
 
 

Answered by Gajendra | 27th Nov, 2017, 10:05: AM

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