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The photoelectric cut-off voltage in a certain experiment is 1.5 V. What is the maximum kinetic energy of photoelectrons

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

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Define the term dipole moment `vecP` of an electric dipole indicating its direction. Write its S.I unit. An electric dipole is placed in a uniform electric field `vecE` . Deduce the expression for the Torque acting on

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

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Show mathematically that the potential at a point on the equatorial line of an electric dipole is

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

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If Nine particles have speeds of 5, 8, 12, 12, 12, 14, 14, 17 and 20 m/s. find :→1) the average speed2) the Most Probable speed3) the r.m.s. Speed of the

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

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According to additive property of charges

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

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Sketch the electric field lines for a uniformly charged hollow cylinder shown in Fig

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A loop, made of straight edges has six corners at A(0,0,0), B(L,O,0) C(L,L,0), D(0,L,0) E(0,L,L) and F(0,0,L). A magnetic field ` B=B_o( hati +hat k)T` is present in the region. The flux passing through the loop ABCDEFA (in that order)

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

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A bar magnet is moving along the common axis of two coils A &B towards A. current is induced

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

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If `I=I_0sin omegat, E = E_0 cos [omegat+pi/3]`. Calculate phase difference between `E and

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

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If `X_L = 50Omega and X_C = 40 Omega.` Calculate effective value of current in given

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A cyclotron’s oscillator frequency is 10 MHz. What should be the operating magnetic field for accelerating protons? If the radius of its ‘dees’ is 60 cm, what is the kinetic energy (in MeV) of the proton beam produced by the accelerator. (e =1.60 × 10–19 C, mp = 1.67 × 10–27 kg, 1 MeV = 1.6 × 10–13

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

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Assertion: If a dipole is enclosed by a surface, then according to Gauss’s law, electric flux linked with it will be zero. Reason: The charge enclosed by a surface is

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

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The electric potential difference between two parallel plates is `2000 V`. If the plates are separated by `2 mm`, then what is the magnitude of electrostatic force on a charge of `4 xx 10^(-6)C` located mid-way between the

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

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A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, then the drift velocity of the electron in

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

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If an ammeter in the given circuit shown in the diagram reads `2A`, the resistance `R`

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

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Consider a point at the focal point of a convergent lens. Another convergent lens of short focal length is placed on the other side. What is the nature of the wavefronts emerging from the final

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

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Which physical quantity has its S.I unit (1) Cm (2)

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

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What is the acceleration of the small ball at the instant of releasing the rod? A thin homogeneous rod of mass m and length `l` is free to rotate in vertical plane about a horizontal axle pivoted at one end of the rod. A small ball of mass m and charge q is attached to the opposite end of this rod. The whole system is positioned in a constant horizontal electric field of magnitude mg `E=(mg)/(2q)`. The rod is released from shown position from

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

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When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain how this observation is consistent with the law of conservation of

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

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An electron emitted by a heated cathode and accelerated through a potential difference of 2.0 kV, enters a region with uniform magnetic field of 0.15 T. Determine the trajectory of the electron if the field(i) is transverse to its initial velocity,(ii) makes an angle of 30º with the initial

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

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