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Find the equivalent resistances of the n...

Find the equivalent resistances of the network shown in figure between the point a and b.

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(a) ` R_eff =((5r/3 xx r)/(5r/3 +r)) = 5r/8`
` (b) R_eff = (r/3)+r = 4r/3 `
` (c) R_eff = (2r/2) = r `
` (d) R_eff = r/4`
` (e) R_eff = r` .
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