To solve this problem it is necessary to apply the concepts related to Young's Module, and find the radius that gives the ratio between the two given materials. Young's module can be defined as,
Where,
F= Force
L = Initial Length
A = Cross-sectional Area
Change in Length
Re-arrange the equation to find the change in Length we have,
If both the Force, as the Area and the initial length are considered constant, we can realize directly that the change in length is inversely proportional to Young's Module, therefore
Applying this concept to that of the two materials (Brass and Tungsten),
If the force caused 
to be stretched, the tungsten will stretch 0.25 of that ratio
Therefore the amount of stretch of Tungsten is 7.5*10^{-7}m
Fundamental quantity : quantities which are independent on other physical quantity .
ex: length,mass,time, current, amount of substance, luminous intensity, thermodynamic temperature,
Derived quantity : quantities which are depend on fundamental quantities.
ex: Area, volume, density, speed, acceleration, force, velocity etc.
Hi Pupil Here's your answer ::
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They are always balanced forces since if they are applied on an object the resultant of tgese forces on the object is Zero
So, the option A is the correct. They are always balanced forces.
The answer to this question is: C) Meteor Shower
The charge of the copper nucleus is 29 times the charge of one proton:
the charge of the electron is
and their separation is
The magnitude of the electrostatic force between them is given by:
where
is the Coulomb's constant. If we substitute the numbers, we find (we can ignore the negative sign of the electron charge, since we are interested only in the magnitude of the force)
