Materials and Components
In solid insulator materials having only one kind of atom, the types of polarization which exist are

Electronic and ionic
Electronic, ionic and permanent
Electronic only

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Materials and Components
Electrical contact materials used in switches, brushes, relay must possess

High thermal conductivity and high melting point
High thermal conductivity and low melting point
Low thermal conductivity and low melting pointL
Low thermal conductivity and high melting point

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