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Two long wires carrying current I1 and I2 are arranged as shown in Fig. The one carrying current I1 is along is the x-axis. The other carrying current I2 is along a line parallel to the y-axis given by x = 0 and z = d. Find the force exerted at O2 because of the wire along the x-axis.

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A proton is projected with a speed of `2 xx10^6 m/s` at an angle of `60^0` to the X-axis. If a uniform mag. field of 0.104 tesla is applied along Y-axis, the path of proton is

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Electrification by rubbing two bodies together is due to transference of ............from one body to the

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Electric Field LinesAn electric field line in general is a curve drawn in such a way that the tangent to it at each point is in the direction of the electric field at that point. A field line is a space curve, i.e. a curve in three dimensions. Electric field lines are thus used to pictorially map the electric field around a charge or a configuration of charges.The density of field lines is more near the charge. Away from the charge, the field is weak, so the density of field lines is less.Choose the correct statement regarding electric lines of

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

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A metallic hollow spherical surface of radius 5 cm is charged such that the potential on its surface is `10 V`. The potential at the centre

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The electrical conductivity of the metal decreases with temperature,

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Assertion: Terminal voltage of a cell is greater than emf of cell during charging the cell. Reason: The emf of a cell is always greater than its terminal

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

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A galvanometer has a resistance of `100 Omega`. A potential difference of `100 mV` between its terminals gives a full scale deflection. The shunt resistance required to convert it into an ammeter reading upto `5A`

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

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At the same place, the horizontal component of earth’s magnetic field is 0.40 G and the angle of dip is 30°. What is the resultant magnetic

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

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Self-Induction Self-induction is the property of a coil by virtue of which the coil opposes any change in the strength of current flowing through it by inducing an emf in itself. This induced emf is also called back emf. When the current in a coil is switched ON, then the self induction opposes the growth of the current and when it is switch OFF, then the self-induction opposes the decay of the current.Calculate the inductance of an air core solenoid containing 300 turns, if length of solenoid is `12pi cm` and its cross-sectional area is `4

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A small telescope has an objective lens of focal length 150 cm and eyepiece of focal length 5 cm. What is the magnifying power of the telescope for viewing distance objects in normal adjustments. If this telescope is used to view a 100 m tall tower 3 km away, then what is the height of the tower formed by the objective

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

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Three light rays, red (R) green (G) and blue (B) are incident on a right angled prism AB C at face AB. The , refractive indices of the material of the prism for red, green and blue wavelengths are 1.39, 1.44 and 1.47 respectively. Out of the three, which colour of ray will emerge out of face AC? Justify your answer. Trace the path of these rays after passing through face

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

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Using Huygens' principle, draw a diagram showing how a plane wave gets refracted, when it is incident on the surface separating a rarer medium from a denser medium. Hence, verify Snell's laws of

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(i) A plane wavefront approaches a plane surface separating two media. If medium 1 is optically denser and medium 2 is optically rarer, using Huygens' principle, explain and show how a refracted wavefront is ^constructed?(ii) Verify Snell's law.(iii) When a light wave travels from a rarer to a denser medium, the speed decreases. Does it imply reduction in its energy?

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

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Monochromatic light of frequency 6.0 ×1014 Hz is produced by a laser. The power emitted is 2.0 ×10–3 W. What is the energy of a photon in the light

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The work function of caesium is 2.14 eV. Find the threshold frequency for

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Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW. How many photons per second, on the average, arrive at a target irradiated by this beam? (Assume the beam to have uniform cross-section which is less than the target

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Calculate the threshold frequency of photon for photoelectric emission from a metal of work function

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An electron and an alpha particle have the same debroglie wavelength associated with them? How are their kinetic energies related to each

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The wavelength λ of a photon and debroglie wavelength of an electron have the same value. Show that the energy of the photon is `(2mcλ)/h` times the kinetic energy of electron where m, c, and h have their usual

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

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