How to find unknown variable|Identities

With the help of circuit diagram, explain how a meter bridge can be used to find unknown resistance of a given wire?

Inequality method to decide monotonic behaviour || Questions to find unknown quantity

How to measure an unknown voltage using potentiometer.

Discuss the experimental demonstration of the formation of beats. How can we find the unknown frequency of a fork (i) by loading with wax (ii) by filing fork ?

How do you use the phenomenon of beats for determination of unknown frequencies ?

A tuning fork of frequency of 512Hz when sounded with unknown tunning fork produces 5 beats/sec. If arms of the unknown fork are filed then it produces only 3 beats/sec. Find the frequency of unknown tunning fork.

Find the product using appropriate identities

Equation a statement of equality which contains one or more unknown quality or variable ( literals) is called an equation

In YDSE setup slits are illuminated by a light of wavelength 4000Å and a light of unknown wavelength. It is observed that fourth dark fringe of known wavelength coincide with second bright fringe of unknown wavelength. Find the unknown wavelength.