A wire of resistance R is divided in 10 equal parts. These parts are connected in parallel, the equivalent resistance of such connection will be 

(1) 0.01 R

(2) 0.1 R

(3) 10 R

(4) 100 R

(1) Each part will have a resistance r=R/10

Let equivalent resistance be rR, then

1rR=1r+1r+1r...........10 times

1rR=10r=10R/10=100RrR=R100=0.01R  

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