The wire of 2 m in length and 4 mm^2 in cross-section has been replaced by a wire of the same material with a length of 1 m and a cross-section of 1 mm^2. How much has the resistance of the wire in the circuit changed?
a. Increased twice.
b. Decreased 8 times.
c. Decreased 2 times.
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c is right ans... of this ques.
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