The melting point. So d is ur answer. The color and texture of both is the same. They sont have magnetism. So the only logical one is melting point.
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Answer:
Explanation:
Given
side of square shape 
Electric flux 
Permittivity of free space 
Flux is given by

where E=electric field strength
A=area
=Angle between Electric field and area vector



and Electric field by a uniformly charged sheet is given by

where
=charge density

