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A closely wound solenoid of 800 turns and area of cross section 2.5 × 10–4 m2 carries a current of 3.0 A. Explain the sense in which the solenoid acts like a bar magnet. What is its associated magnetic

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Two parallel long wires A and B carry currents I1 and I2 . (I2 < I1 ) when I1 and I2 are in the same direction the mag. field at a point mid way between the wires is 10 µT. If I2 is reversed, the field becomes `30 muT` . The ratio `I_1/ I_2` is

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A student connect a moving coil voltmeter V and 9 moving coil Ammeter A and resistor R as shown in figure ? If the voltmeter reads 10 volt and the ammeter reads 2 Amp then R is

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The effective length of a magnet is 31.4 cm and its pole strength is 0.5 A.m. The magnetic moment, if it is bent in the form of a semicircle will be ......................Amp.`m^2`

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Which of the following is not a property of electric field

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Unit of electrical potential

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A charge `Q` is placed at the origin. The electric potential due to this charge at a given point in space is `V`. The work done by an external force in bringing another charge `q` from infinity upto the point

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The potential in the equatorial plane of a dipole having dipole moment `p`

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Two identical capacitors each of capacitance `5 muF` are charged to potentials `2 kV and 1 kV`, respectively and their negative ends are connected together. When the positive ends are also connected together, the loss of energy of the system

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Assertion: Two infinitely long wires A and B carry unequal currents in inward direction.Then, there is only one point (excluding the points at infinity), where net magnetic field is zero.Reason: That point lies between points A and

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Assertion: Magnetic flux and the electric flux have the same units. Reason: Flux passing through a surface does not gives an idea about the field lines crossing that

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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(i) Write the necessary conditions for the phenomenon of total internal reflection to occur. (ii) Write the relation between the refractive index and critical angle for a given pair of optical

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Use the mirror equation to show that (i) An object placed between `f` and `2f` of a concave mirror produces a real image beyond `2f`. (ii) A convex mirror always produces a virtual image independent of the location of the object. (iii) An object placed between the pole and focus of a concave mirror produces a virtual and enlarged

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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(i) A point object O is kept in a medium of refractive index in front of a convex spherical surface of radius of curvature R which separates the second medium of refractive index `n_2` from the first one, as shown in the figure.Draw the ray diagram showing the image formation and deduce the relationship between the object distance and the image distance in terms of `n_1 , n_2 and R`.(ii) When the image formed above acts as a virtual object for a concave spherical surface separating the medium `n_2` from `n_1(n_2 > n_1)` , draw this ray diagram and write

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The objective of an astronomical telescope has a diameter of 150 mm and a focal length of 4.00 m. The eyepiece has a focal length of 25.00 mm. Calculate the magnifying and resolving power of telescope. (`lambda = 6000 A^o` for yellow

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Discuss the intensity of transmitted light when a polaroid sheet is rotated between two crossed

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(i) AJse Huygens' geometrical construction to show how a plane wavefront at t = 0 .propagates and produces a wavefront at a later time.(ii) Verify, using Huygens' principle, Snell's law of refraction of a plane wave propagating from a denser to a rarer medium.(iii) When monochromatic light is incident on a surface separation two media, the reflected and refracted light both have the same frequency. Explain

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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(i) What is the effect on the interference fringes to a Young's double slit experiment when (a) the separation between the two slits is decreased? (b) the width of the source slit is increased? (c) the monochromatic source is replaced by a source of white light? Justify your answer in each case.(ii) The intensity at the central maxima in Young's double slit experimental set up is `I_0`. Show that the intensity at a point where the path difference is `lambda//3` , is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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For a single slit of width a, the first minimum of the interference pattern of `a `monochromatic light of wavelength `lambda`, occurs at an angle of `lambda//a`. At the same angle of `lambda//a`, we get a maximum for two narrow slits separated by a distance `a`.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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What is the path difference for the two waves as given in the fig.`theta' is 'pi/20

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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