An electric dipole of length $$2 \mathrm{~cm}$$ is placed at an angle of $$30^{\circ}$$ with an electric field $$2 \time

Two long parallel wires kept $$2 \mathrm{~m}$$ apart carry $$3 \mathrm{~A}$$ current each, in the same direction. The fo

Which of the following has its permeability less than that of free space?

A square shaped coil of side $$10 \mathrm{~cm}$$, having 100 turns is placed perpendicular to a magnetic field which is

Which one of the following electromagnetic radiation has the least wavelength?

In a Young's double-slit experiment, the screen is moved away from the plane of the slits. What will be its effect on th

The energy of a photon of wavelength $$\lambda%$ is

The ratio of the nuclear densities of two nuclei having mass numbers 64 and 125 is

During the formation of a $$p$$-$$n$$ junction:

The diagram shows four energy level of an electron in Bohr model of hydrogen atom. Identify the transition in which the

Which of the following graphs correctly represents the variation of a particle momentum with its associated de-Broglie w

The capacitors, each of $$4 \mu \mathrm{F}$$ are to be connected in such a way that the effective capacitance of the com

Which of the following statements about a series LCR circuit connected to an ac source is correct?

According to Huygens principle, the amplitude of secondary wavelets is

The radius of the $$\mathrm{n}^{\text {th }}$$ orbit in Bohr model of hydrogen atom is proportional

Assertion (A) : The resistance of an intrinsic semiconductor decreases with increase in its temperature. Reason (R) : Th

Assertion (A) : The equivalent resistance between points A and B in the given network is 2R. Reason (R) : All the resist

Assertion (A): The deflecting torque acting on a current carrying loop is zero when its plane is perpendicular to the di

Draw a graph showing the variation of potential energy of a pair of nucleons as a function of their separation. Indicate

(a) How will the De Broglie wavelength associated with an electron be affected when the (i) velocity of the electron dec

Identify the electromagnetic wave whose wavelengths range is from about (a) $$10^{-12} \mathrm{~m}$$ to about $$10^{-8}

Depict the orientation of an electric dipole in (a) stable and (b) unstable equilibrium in an external uniform electric

(a) Write the expression for the Lorentz force on a particle of charge $$q$$ moving with a velocity $$\vec{v}$$ in a mag

The potential difference applied across a given conductor is doubled. How will this affect (i) the mobility of electrons

Two coils $$C_1$$ and $$C_2$$ are placed close to each other. The magnetic flux $$\phi_2$$ linked with the coil $$\mathr

(a) A plane wave-front propagating in a medium of refractive index '$$\mu_1$$' is incident on a plane surface making an

An alternating voltage of $$220 \mathrm{~V}$$ is applied across a device $$X$$. A current of 0.22 A flows in the circuit

State the basic principle behind the working of an ac generator. Briefly describe its working and obtain the expression

(a) Briefly describe how the current sensitivity of a moving coil galvanometer can be increased. (b) A galvanometer show

(a) (i) Differentiate between 'distance of closest approach' and 'impact parameter'. (ii) Determine the distance of clos

(a) (i) Explain how free electrons in a metal at constant temperature attain an average velocity under the action of an

(a) Draw the circuit arrangement for studying V-I characteristics of a $$p$$-$$n$$ junction diode in (i) forward biasing

(a) (i) Draw a ray diagram to show the working of a compound microscope. Obtain the expression for the total magnificati

A lens is a transparent optical medium bounded by two surfaces; at least one of which should be spherical. Considering i

A capacitor is a system of two conductors separated by an insulator. The two conductors have equal and opposite charges