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a circle is constructed of a uniform wire of residence

Posted by Vijendra Singh 7 years ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 6 months ago

A circle is constructed of a uniform wire of resistance of 2 ohm per cm and is connected in a circuit such that it offers maximum resistance. fins the maximum resistance. (take radius of the circle as 7 cm).

The radius of the wire is given as 7 cm. The length of the wire is the circumference of the circle.
So,
Length = 2π r = 2 x 227×7= 44 cmNow, Resistance per unit length = 2 ohmSo, total resistance = resistance per unit length × length = 44 ×2=88 ohm

The resistance will be maximum if it is connected in series.

Thus, the maximum resistance is 88 ohm.

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