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प्रश्न
A wire of length 5 m has a resistance of 2.0 Ω calculate:
(a) the resistance of wire of length 1 m
(b) the equivalent resistance if two such wires each of length 2 m are joined in parallel.
(c) the resistance of 1 m length of wire of same material but of half diameter.
उत्तर
(a)
V = 4 V
I = 0.4 A
Total Resistance R'=?
R' = V/I = 0.4/4 = 10 ohm
(b)
R1= 20 ohm
R' = 10 ohm
`1/R=1/R+1/R_1`
`1/10=1/R+1/20`
`1/R=1/10-1/20=1/20`
`R=20Ω `
(c)
R = 20 ohm
V = 4 V
I = V/R = 4/20 = 0.2 A
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