Physics Test - ...

The relation between the electric field intensity E and the linear charge density λ for an infinitely long straight uniformly charged wire is:

A coil of wire of radius \(\mathrm{R}\) has 200 turns and self - inductance of \(108 \mathrm{mH}\). The self inductance of a similar coil of 500 turns will be:

Which logic gates are represented by the following combination of logic gates?

The best conductor of heat among liquids is?

Two coaxial solenoids are made by winding thin insulated wire over a pipe of cross-sectional area \(A=10 \mathrm{~cm}^{2}\) and length \(=20 \mathrm{~cm}\). If one of the solenoids has 300 turns and the other 400 turns, their mutual inductance is:

\(\left(\mu_{0}=4 \pi \times 10^{-7} \mathrm{Tm} \mathrm{A}{ }^{-1}\right)\)

Diameter of plano-convex lens is \(6 \mathrm{~cm}\) and thickness at the centre is \(3 \mathrm{~mm}\). If speed of light in material of lens is \(2 \times 10^{8} \mathrm{~m} / \mathrm{s}\), the focal length of the lens is:

From the figure, what is β_ac when V_CE is 10V and I_c is 4 mA?

Electromagnetic waves are generated by-

A short linear object of length b lies along the axis of a concave mirror of focal length \(\mathrm{f}\) at a distance u from the pole of the mirror. The size of the image is approximately equal to:

The force between two charges is \(200 N\). If the distance between the charges is doubled, the force will be ________.