Physics Test 23...

Choose the most appropriate answer from the options given below:

In the following circuit, the equivalent capacitance between terminal A and terminal B is

The metre bridge shown is in balance position with  If we now interchange the positions of galvanometer and cell, will the bridge work? If yes, what will be balance condition ?

The number of photons of wavelength 540 nm emitted per second by an electric bulb of power 100W is: (taking h = 6 × 10⁻³⁴ Js)

Suppose the charge of a proton and an electron differ slightly. One of them is –e, the other is (e + Δe). If the net of electrostatic force and gravitational force between two hydrogen atoms placed at a distance d (much greater than atomic size) apart is zero, then Δe is of the order of [Given mass of hydrogen m_h = 1.67 × 10^–27 kg]

Two different coils of self inductance L₁ and L₂ are placed close to each other so that the effective flux in one coil is completely linked with other. If M is the mutual inductance between them, then

An alternating current I in an inductance coil varies with time t according to the graph as shown: Which one of the following graphs gives the variation of voltage with time?

A 800 turn coil of effective area 0.05 m² is kept perpendicular to a magnetic field 5 × 10⁻⁵ T. When the plane of the coil is rotated by 90° around any of its coplanar axis in 0.1 s, the emf induced in the coil will be :

A body floats in a liquid contained in a beaker. The whole system as shown falls freely under gravity. The upthrust on the body due to the liquid is

Imagine a light planet revolving around a very massive star in a circular orbit of radius r with a period of revolution T. If the gravitational force of attraction between the planet and the star is proportional to r^5/2, then the square of the time period will be proportional to.