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(A) : Various regular polygons are formed by a constant length current carrying wire. The magnetic field at their centers increases with increase in number of turns. (R) : A magnetic dipole in a uniform magnetic field experiences a net force.

A car moving with a velocity v, overtakes a person moving with a velocity v_2. The ratio of frequencies of sound Just before and after overtaking, is:

A point charge causes an electric flux of -1.0xx10^(3) Nm^(2)//C to pass through a spherical Gaussian surface of 10.0 cm radius centred on the charge. If the radius of the Gaussian surface were doubled, how much flux would pass through the surface?

The slope of the graph showing the variation of potential difference V on x-axis and current I on y-axis gives the conducts

In the circuit shown in figure the emf E of the battery is increased linearly from zero to 28 V in the interval 0 le t le 14 s. (a) find the energy gained by the 10 V cell in the interval 0 le t le 14 s. (b) At what time the 10 V cell begin to charge?

In the diffraction pattern due to single slit of width 'a' with incident light of wavelength lambda with angle of diffraction theta, the condition for the first minimum is

Three concurrent forces of the same magnitude are in equilibrium. What is the angle between the forces ? Also name the triangle formed by the forces as sides :

A charged capacitor and an inductor are connected in series. At time t = 0, the current is zero, but the capacitor is charged. If T is the period of the resulting oscillations, the next time after t = 0, the maximum voltage across the inductor is

What is coordination number of atom in cubic close packing

A fish is 60 cm under water ( mu=4//3). A bird directly overhead looks at the fish. If the bird is at a distance of 120 cm from the water surface, (a) What is the apparent position of the fish as seen by the bird and (b) what is the apparent position of the bird as seen by the fish?

A whistle of frequency 385Hz rotates in a horizontal circle of radius 50cm at an angular speed of 20 radians s^-1 the lowest frequency heard by a listener a long distance way at rest with velocity to the centre of the circle given velocity of sound equal to 340 ms^-1 is

Two positive point charges of magnitude Q each are separated by a distance "2a". A test charge 'g_0' is located in a plane which is normal to the line joining these charges and midway between them. The locus of the points in this plane for which the force on the test charge has a maximum value is

What was Diwan's order?

Draw a neat labelled diagram to show (i) primary rainbow and (ii) secondary rainbow.

Two objects with masses m_(1) and m_(2) are moving along the x-axis in the positive direction with speeds v_(1) , and v_(2) , respectively, where v_(1) is less than v_(2) . The speed of the centre of mass of this system of two bodies is

The refractive index of the material of an equilateral prism is 1.3. The angle of minimum deviation due to the prism would be

A nucleus of _84Po^210 originally at rest emits an alpha-particles with speed v. What will be the recoil speed of the daughter nucleus ?

The process responsible for energy production in the Sun is ................ .

What we name that exists in both particle and wave form ?

A magnet takes a minute to make 30 oscillations in a magnetic field. If the strength is doubled, then the time period of oscillation (in S) is

(A): Cobalt -60 is useful in cancer therapy. (R): Cobalt-60 is a source of gamma-radiations capable of killing cancerous cells.

Given the mass of iron nucleus as 55.85u and A=56, find the nuclear density?

Three uncharged capacitors A, B and C are connected as shown in the figure. The charge on capacitor B is , the steady state.

(A) : Photoelectric effect can only be explained by the particle nature of light. (R): For every metal there exists a limiting frequency of the incident light called, threshold frequency, below which electron einission is not possible.

Two infinite sheets of unifrom charge density +sigma and -sigma are parallel to each other as shown in the figure. Electric field at the

A uniform magnetic field exists in certain space in the plane of the paper and initially it is directed from left to right. When a rood of soft iron is placed parallel to the field-direction, the magnetic lines of force passing within the rod will be represented by figure

ABCD is a square of side 1m. Charges of +3nC, -5nC and +3nC are placed at the comers A, B and C respectively. Calculate the work done in transferring a charge of 12mu c from D to the point of intersection of the diagonals?

How does the refractive index of a layer of ionosphere change for propagation of a radio wave, if the rate of ionisation increases?

Describe the Bohr quantum conditions in terms of the wave theory: demonstrate that an electron in a hydrogen atom can move only along those round orbits which accommodate a whole number of de Broglie waves.

For a certain orgas pipe, three succes ssive resonance frequencies are observed ol 425, 595 and 765 Hz respectively. Thking the speed of sound in air to be 340 m/s (a) Explain whether the pipe is closed at one end or open at both ends b) Determine the fundamental frequency and length of the pipe.

A conducting loop is held stationary normal to the magnetic field between the north and south poles of two fixed permanent magnets can you hope to generate a current in the loop?

A point object is placed at a distance of 25cm from a convex lens of focal length20cm .If a glass slab of thickness t and refractive index1.5 is inserted between the lens and object.The image is formed at infinity .Find the thickness?

(a) Derive the expression for the torque acting on a current carrying placed in a magnetic field. (b) Explain the significance of a radial magnetic when current carrying coil is kept in it.

What is the energy of the electron revolving in third orbit expressed in eV?

In the following question a statement of assertion (A) is followed by a statement of reason (R ) A : capacitor is a device which stores electric energy in the form of electric field . R : Net charge on the capacitor is always zero.

A coil of surface area 100 cm^2 having 50 turns is held perpendicular to the magnetic field of intensity 0.02 "Wb m"^(-2). The resistance of the coil is 2 Omega . If it is removed from the magnetic field in 1s, the induced charge in the coil is ____

Solar constant of the sun is the energy received by earth per minute per cm^(2). Its dimensions will be :

Which of the following is the correct prefix with the word "healthy

Calculate the value of the resistance R in the circuit shown in Fig. so that the current in the circuit is 0.2 A. What would be the potentialdifference between points B and E ?