Physics

What is the exact difference between force and torque?

The magnitude and direction of the current in the following circuit is

Given below are two statements:

Statement I: Biot-Savart's law gives us the expression for the magnetic field strength of an infinitesimal current element (Idl) of a current carrying conductor only

Statement II: Biot-Savart's law is analogous to Coulomb's inverse square law of charge q, with the former being related to the field produced by a scalar source, Idl while the latter being produced by a vector source, q.

In light of above statements choose the most appropriate answer from the options given below:

The equivalent capacitance of the system shown in the following circuit is:

If ${\text{∮}\mathrm{}}_{\mathrm{s}}\vec{\mathrm{E}}\cdot \overrightarrow{\mathrm{d}\mathrm{S}}=0$  over a surface, then:

A spherical ball is dropped in a long column of a highly viscous liquid. The curve in the graph shown, which represents the speed of the ball $\left(v\right)$ $$ as a function of time $\left(t\right)$ $$ is :

An electric dipole is placed at an angle of ${30}^{?}$ with an electric field of intensity $2*{10}^5{\mathrm{N}\mathrm{C}}^{-1}$ . It experiences a torque equal to $4\mathrm{N}\mathrm{m}$ . Calculate the magnitude of charge on the dipole, if the dipole length is $2\mathrm{c}\mathrm{m}$ .

The ratio of frequencies of fundamental harmonic produced by an open pipe to that of a closed pipe having the same length is

The temperature of a gas is $-{50}^{?}\mathrm{C}$ . To what temperature ${327}^{?}\mathrm{C}$ the gas should be heated so that the rms speed is increased by 3 times?

When two monochromatic lights of frequency, $v$ $$ and $\frac{v}{2}$ $\frac{}{}$ are incident on a photoelectric metal, their stopping potential becomes $\frac{V_S}{2}$ $\frac{{}_{}}{}$ and $V_S$ ${}_{}$ respectively. The threshold frequency for this metal is