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A long cylindrical wire carries a positive charge of linear density `lambda. An electron `(-e, m)` revolves around it in a circular path under the influence of the attractive electrostatic force The speed of electron

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

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State the conditions under which total internal reflection occurs. One face of a prism with a refracting angle of 30° is coated with silver. A rayincident on another face at an angle of 45° is refracted and reflected from the silver coated face and retraces its path. Find the refractive index of the material of the

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

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A magnetic field ` hatB = B_o sin( ωt) hat k` covers a large region where a wire AB slides smoothly over two parallel conductors separated by a distance d (Fig.). The wires are in the x-y plane. The wire AB (of length d) has resistance R and the parallel wires have negligible resistance. If AB is moving with velocity v, what is the current in the circuit. What is the force needed to keep the wire moving at constant

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

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Study the circuits (a) and (b) shown in Fig and answer the following questions. Under which conditions would the rms currents in the two circuits be the

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

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A coil having area `2m^2` is placed in a magnetic field which changes from 1 wb /`m^2` to 4 wb/`m^2` in an interval of 2 second. The emf induced in the coil of single turn

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

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A convex lens of focal length 30 cm is placed coaxially with a convex mirror of radius of curvature 20 cm. The two are kept at 15 cm from each other. A point object lies 60 cm in front of the convex lens. Draw a ray diagram to show the formation of the image by the combination. Determine the nature and position of the image

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

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The energy flux of sunlight reaching the surface of the earth is 1.388 × 103 W/m2 . How many photons (nearly) per square metre are incident on the Earth per second? Assume that the photons in the sunlight have an average wavelength of 550

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

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The distance of the field point on the equatorial plane of a small electric dipole is halved. By what factor will the electric filed

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

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It is claimed that two cesium clocks, if allowed to run for 100 years, free from any disturbance, may differ by only about 0.02 s. What does this imply for the accuracy of the standard cesium clock in measuring a time-interval of 1 s

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Two capillary tubes of length 15 cm and 5 cm and radii 0.06 cm and 0.02 cm respectively are connected in series. If the pressure difference a cross the end faces is equal to the pressure of 15 cm high water column, then find the pressure difference across the : → 1) first tube 2) Second

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Find the applied horizontal force on BC, (F) as a function of time `'t' (t < l/v)`A conducting square wire frame ABCD of side `l` is pulled by horizontal force so that it moves with constant velocity v. A uniform magnetic field of strength B is existing perpendicular to the plane of wire. The resistance per unit length of wire is `lambda` and negligible self inductance. If at `t= 0,` frame is just at the boundary of magnetic field.

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

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Current through the `5 Omega` resistor

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

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A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r(much larger than the size of the dipole), then the electric field at Q is proportional

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

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For the system shown in figure find Q for which resultant force on q is

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A simple pendulum is suspended in a lift which is going up with an acceleration of `5 m'/'s^2` . An electric field of magnitude 5 N/C and directed vertically upward is also present in the lift . The charge of the bob is `1 muC` and mass is 1 mg . Taking `g=pi^2` and length of the simple pendulum 1m, find the time period of the simple pendulum (in

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

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Match the Column I (quantities) with Column II (approximate values) and select the correct answer from the codes given below. Column I Column II A. Escape velocity of earth p. `1.6 m'/'s^2` B. Gravitational acceleration at moon’s surface q. `6400 km` C. Radius of earth r. `11.2 km'/'s`

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Give three properties of electric charge.?

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

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Assertion: `E` in outside vicinity of a conductor depends only on the local charge density a and it is independent of the other charges present anywhere on the conductor. Reason: `E` in outside vicinity of a conductor is given by

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

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Proton in an Electric Field Potential difference `(DeltaV)` between two points `A and B` separated by a distance `x`, in a uniform electric field `E` is given by `DeltaV =-Ex`, where `x` is measured parallel to the field lines. If a charge `q_0` moves from A to B, the change in potential energy `(DeltaU)` is given as `DeltaU=q_0 DeltaV`. A proton is released from rest in uniform electric field of magnitude `8.0 xx 10^4 Vm^(-1)` directed along the positive X-axis. The proton undergoes a displacement of 0.50 m in the direction of E.Mass of a proton `= 1.66 xx 10^(-27)

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

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It is difficult to remove a free electron from copper than from sodium?

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

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