Magnetic Materials — Physics STD 12 Science — Question

Explain with neat circuit diagram how will you determine unknown resistance by using meterbridge experiment.

Using the energy conservation, derive the expressions for the minimum speeds at different locations along a vertical circular motion controlled by gravity. Is zero speed possible at the uppermost point? Under what condition/s? Also prove that the difference between the extreme tensions (or normal forces) depends only upon the weight of the object.

In a biprism experiment, the fringes are observed in the focal plane of the eye-piece at a distance of \(1.2 m\) from the slit. The distance between the central bright band and the \(20^{\text {th }}\) bright band is \(0.4 cm\). When a convex lens is placed between the biprism and the eye-piece, \(90 cm\) from the eye-piece, the distance between the two virtual magnified images is found to be \(0.9 cm\). Determine the wavelength of light used.

Give an example of some familiar process in which heat is added to an object, without changing its temperature.

What are a and ẞ parameters for a transistor? Obtain a relation between them.

State the function of the shunt in modifying a galvonometer to an ammeter.

state the principle of superposition of waves.

A meter gauge train is moving at \(72 km / hr\) along a curved railway of radius of curvature \(500 m\) at a certain place. Find the elevation of outer rail above the inner rail so that there is no side pressure on the rail. \(\left(g=9.8 m / s ^2\right)\)