Physics M.C.Q (1 Marks)

Consider the two idealised systems: (i) a parallel plate capacitor with large plates and small separation and (ii) a long solenoid of length L > > R, radius of cross-section. In (i), E is ideally treated as a constant between plates and zero outside. In (ii), magnetic field is constant inside the solenoid and zero outside. These idealised assumptions, however, contradict fundamental laws as below:

In a compound microscope, maximum magnification is obtained when the final image

A microscope is focused on a mark. Then a glass slab of refractive index 1.5 and thickness 6 cm is placed on the mark. To get the mark again in focus the microscope should be moved

Two bulbs each marked 100 W, 220 V are connected in series across 220 V supply. The power consumed by them, when lit, is

In Huygens' theory, light waves

In the middle of the depletion layer of reverse biased p-n junction, the:

The current in the circuit shown in the figure considering ideal diode is

An electric dipole placed in a non-uniform electric field can experience

An equilateral triangle is made by uniform wires AB, BC, CA. A current I enteres at A and leaves from the midpoint of BC. If the lengths of each side of the triangle is L, the magnetic field B at the centroid O of the triangle is: