Physics Ncert Solutions Class 12th

Effective capacitance of parallel combination of two capacitors $C_1$ ${}_{}$ and ${}_{}$ $C_2$ is $10\mu \mathrm{F}$ $$ . When these capacitor are individually connected to a voltage source $1\mathrm{V}$ of $1\mathrm{V}$ $$ , the energy stored in the capacitor $C_2$ ${}_{}$ is 4 times that of ${}_{}$ $C_1$ . If these capacitors are connected in series, their effective capacitance will be

Which of the following given a reversible operation?

In finding the electric field using Gauss law the formula $\left|\stackrel{?}{E}\right|=\frac{q_{\text{enc}}}{{\epsilon }_0\left|A\right|}$ $\stackrel{}{}\frac{{}_{}}{{}_{}}$ is applicable. In the formula ${\epsilon }_0$ ${}_{}$ is permittivity of free space, $A$ $$ is the area of Gaussain surface and $q_{\text{enc}}$ ${}_{}$ is charge enclosed by the Gaussian surface. This equation can be used in which of the following situation? Only when the Gaussian surface is an

A 25 m long antenna is mounted on an antenna tower. The height of the antenna tower is 75m. The wavelength (in meter) of the signal transmitted by this antenna would be

Find out the surface charge density at the intersection of point x = 3 m plane and x-axis, in the region of uniform line charge of 8 nC/m lying along the z-axis in free space.

Two identical antennas on identical towers are separated from each other by a distance of 45 km. What should be the minimum height of receiving antenna to receive the signals in line of sight? (Assume radius of earth is 6400 km)

The following logic gate is equivalent to:

The maximum amplitude wave is found to be 12 V while the minimum amplitude is found to be 3 V. The modulation index is 0.6x where x is _____.

Find the truth table for the function Y of A and B represented in the following figure.

In a semiconductor, the number density of intrinsic charge carriers at 27°C is 1.5 * 10¹? / m³. If the semiconductor is doped with impurity atom, the hole density increases to 4.5*10²² / m³. The electron density in the doped semiconductor is __________ x 10? / m³.