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An electric dipole is placed along the x-axis at the origin o. A point P is at a distance of 20 cm from this origin such that OP makes an angle `π/ 3` with the x-axis. If the electric field at P makes an angle `theta` with the x-axis, the value of `theta` would be

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

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The kinetic energy of a particle executing S.H.M. is 16J when it is in its mean position. If the amplitude of oscillations is 25cm and the mass of the particle is 5.12kg. Calculate the time period of

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

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Two charges –q each are fixed separated by distance 2d. A third charge q of mass m placed at the mid-point is displaced slightly by x (x << d) perpendicular to the line joining the two fixed charged as shown in Fig. . Show that q will perform simple harmonic oscillation of time period..

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

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There are two coils A and B seperated by some distance. If a current of 2 A flows through A, a magnetic flux of 10-2 Wb passes through B (no current through B). If no current passes through A and a current of 1 A passes through B, what is the flux through

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

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A conducting wire XY of mass m and neglibile resistance slides smoothly on two parallel conducting wires as shown in Fig . The closed circuit has a resistance R due to AC. AB and CD are perfect conductors. There is a magnetic field` B = B(t )hatk` . For

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

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An electrical device draws 2kW power from AC mains (voltage223V (rms) = `sqrt50,000` V).The current differs (lags) in phase by `φ tan φ=-3/4` as compared to voltage. Find `X_C –

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

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The variation of induced emf with time in a coil if a short bar magnet is moved along its axis with constant velocity

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

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An alternating current is given by the `eq^n` I = I1 coswt + I2 sinwb. The rms current is given

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

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The resistance of an R-L circuit is `10_Omega`. An emf `E_O` applied across the circuit at `omega = 20 rad`/s. If the current in the ckt is `I_o/sqrt2` what is the value of

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

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A periodic voltage wave form has been shown in fig. Determine. (a) Frequency of the wave form. (b) Average

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

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For what frequency the voltage across the resistance R will be

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

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A square coil of side 10 cm consists of 20 turns and carries a current of 12 A. The coil is suspended vertically and the normal to the plane of the coil makes an angle of 30º with the direction of a uniform horizontal magnetic field of magnitude 0.80 T. What is the magnitude of torque experienced by the

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

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The diagrams given in Fig. show magnetic field lines (thick lines in the figure) wrongly. Point out what is wrong with them.

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

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Does a bar magnet exert a torque on itself due to its own field? Does one element of a current-carrying wire exert a force on another element of the same

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

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Magnetic field arises due to charges in motion. Can a system have magnetic moments even though its net charge is

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

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A short bar magnet has a magnetic moment of 0.48 J T –1. Give the direction and magnitude of the magnetic field produced by the magnet at a distance of 10 cm from the centre of the magnet on the equatorial lines (normal bisector) of the

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

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A sample of paramagnetic salt contains 2.0 × 1024 atomic dipoles each of dipole moment 1.5 × 10–23 J T –1. The sample is placed under a homogeneous magnetic field of 0.64 T, and cooled to a temperature of 4.2 K. The degree of magnetic saturation achieved is equal to 15%. What is the total dipole moment of the sample for a magnetic field of 0.98 T and a temperature of 2.8 K? (Assume Curie’s

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

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A toroid of n turns, mean radius R and cross-sectional radius a carries current I. It is placed on a horizontal table taken as x-y plane. Its magnetic moment

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

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Let the magnetic field on earth be modelled by that of a point magnetic dipole at the centre of earth. The angle of dip at a point on the geographical

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

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Two charged particles traverse identical helical paths in a completely opposite sense in a uniform magnetic field B = `B_0

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

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