Question

which one among a bar of an alloy of mass 2kg and a 3 kg iron bar of same dimension has greater resistivity​

Answer 1

Answer: Alloy bar because it has different types of atoms.

Explanation:

Answer 2

Which one among a bar of an alloy of mass 2 kg and a 3 kg ironbar off the  same dimension has greater resistivity?

(a) Iron bar because it has higher mass.

(b) Alloy bar because it has lower mass.

(c) Iron bar because it has the same types of atoms.

(d) Alloy bar because it has different types of atoms.

Answer:

(d) Alloy bar because it has different types of atoms.

Explanation:

• Electrical resistivity is the measurement that quantifies how strongly a material opposes the flow of electric current.
• Alloys are the combination of two or more elements and one of the elements is a metal.
• Alloys have a random arrangement of ions, unlike metals which have a specific arrangement. This arrangement of alloys increases its resistivity.
• Alloying of metals leads to increased scattering of electrons which increases the resistivity of the metal.
• The presence of impurities can affect the resistivity of the alloy, these include the elements that are used as an alloying agent.
• Alloys such as constantan and manganin are used in making resistance coils as they have high resistivity and a low-temperature coefficient of resistivity.

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