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A wire of given material having length I...

A wire of given material having length I and area of cross-section A has a resistance of `8Omega`. What would be the resistance of another wire of the same material having length `l/2` and area of cross-section 4A?

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Yes, the handle and bristles of a toothbrush should be made of the same material, i.e. plastic. However, the nature and type of plastic material used in the handle and bristles shoud be different.
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