Question

A metal rod of length 10 cm and a rectangular cross-section of 1cm × 1/2 cm is connected to a battery across opposite faces. The resistance will be(a) maximum when the battery is connected across 1 cm × 1/2 cm faces(b) maximum when the battery is connected across 10 cm × 1 cm faces(c) maximum when the battery is connected across 10 cm × 1/2 cm faces(d) same irrespective of the three faces

Answer 1

Answer: 1 cm X  1/2 cm

Explanation:

 resistance is inversely proportional to area so lesser the area greater will be the resistance.....

hope this helps you!

Answer 2

Answer:

A metal rod of length 10cm and a rectangular cross section of 1cm× 1/2 cm is connected to a battery across opposite faces. The resistance will be - maximum when the battery is connected across 1cm × 1/2 cm faces.(Option-a)

Explanation:

Solution detail:

The resistance of wire depend upon different aspects like it's zone, resistivity and length .

The connection between resistance and the different boundary is given by

                                 R=ρl/A

R ∝l/A describe  about the resistance will be maximum when area is minimum and the length of the conductor is maximum.

So, Option(a) is correct ,where length is 10cm ,and the area is 1×1/2 cm^2.

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