Physics
Find the resistance (in mega) of a wire of length 20m, cross sectional area 1 cm2 and made of a material of resistivity 200m.

4000
2000
40
80

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Physics
An egg sinks in soft water but floats in a concentrated solution of salt because

Water has high surface tension
Albumin dissolves in salt solution and egg becomes lighter
The density of salt solution exceeds the density of eggs
Egg absorbs salt from the solution and expands

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