Question

Q7. Phosphor-bronze is used for
making suspension wire or hair
springs, because it is *
O (a) bad conductor of electricity
O
(b) having small value of restoring
torque per unit twist
O
(c) having large value of restoring
torque per unit twist
O (d) a magnetic substance
​

Answer 1

option c is the answer

Explanation:

Phosphor-Bronze wire is used for suspension in a moving coil galvanometer because it has small restoring torque per unit twist and high tensile strength.

so option c is the answer

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Answer 2

Answer:

Phosphor-bronze is used for making suspension wire or hair springs, because it has (b) having small value of restoring torque per unit twist.

Explanation:

What is restoring torque:

• The restoring torque is the torque that rises when an object (twisted, rotating, etc.) is returned to its original orientation.
• The oscillations of a basic pendulum are a great example of the effects of torque restoration.

Why Phosphor- bronze is used for making suspension wires:

Restoring torque   τ=Kθ,

where K is torsional constant.

Since, value of K is very small in Phosphor-bronze wire, so a small restoring torque is generated in the wire or in other words, Phosphor-bronze wire has small couple per unit twist.

So Phosphor-bronze wire is used for making suspension wire or hair springs.