Question

The apparatus used to determine the young's modulus of the material of a given wire is called
(A) Newton’s apparatus
(B) Wheatstone’s apparatus
(C) Searle’s apparatus
(D) Young’s apparatus

Answer 1

Hint To answer the question we must know the working and usage of all the apparatus given in the question through which we can differentiate and choose the best suitable amongst them.

Complete step by step answer

In the question we have been asked about the apparatus used in the Young’ modulus of the material. So first of all Young’s modulus of a material is defined as the mechanical property of a solid under compression but only in one direction.

Now, Newton's apparatus is used in Newton’s rings experiment to spot Newton's rings also known as Interference fringes. Wheatstone’s in the Wheatstone bridge experiment to measure the electrical resistance. But Searle’s apparatus is used to determine the Young’s modulus of the material of a given wire.

It is made up of two wires of equal lengths which are attached to an inflexible support.

Therefore, the correct option is C.

Additional Information For better understanding we must know Searle’s apparatus precisely. So it contains two wires namely, Auxiliary wire and Experimental wire stick to a rigid support. Following them, other things present in the apparatus are a disk, spirit level, spherometer screw, pitch scale, slotted weights and dead loads.

 The S.I. unit of Young’s modulus determined by Searle’s apparatus is, $ \dfrac{N}{m^{2}}$

Note In this question an option Young’s apparatus was also given to trick the students. Those who don’t know the definitions, working and usage of the apparatus will surely make mistakes and choose it.