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A short electric dipole of dipole moment `vecp` is placed at a distance r from the centre of a solid metallic sphere of radius a

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Two Points P and Q are maintained at the Potentials of 10 v and –4 v, respectively. Thework done in moving 100 electrons from P to Q is

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In a certain region of space, electric field is along the z-direction throughout. The magnitude of electric field is, however, not constant but increases uniformly along the positive z-direction, at the rate of 105 NC–1 per metre. What are the force and torque experienced by a system having a total dipole moment equal to 10–7 Cm in the negative z-direction

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Same as problem 4 except the coil A is made to rotate about a vertical axis (Fig ). No current flows in B if A is at rest. The current in coil A, when the current in B (at t = 0) is counterclockwise and the coil A is as shown at this instant, t = 0,

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An alternating current generator has an internal resistance Rg and an internal reactance Xg. It is used to supply power to a passive load consisting of a resistance Rg and a reactance XL. For maximum power to be delivered from the generator to the load, the value of XL is equal

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

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In an alternating current circuit consisting of elements in series, the current increases on increasing the frequency of supply. Which of the following elements are likely to constitute the circuit

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 I M. Another device has twice the values for R, XC and XL. How are the answers

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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Same current is flowing in two alternating circuits.The first circuits contains only inductance and the other contains only a capacitor. If the frequency of the emf of ac is increased the effect on the value of the current will

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

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In a circuit L, C and R are connected in series with an alternating voltage source of frequency f. The current leads the voltage by `45^0` . The value of c

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

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When an alternating voltage of 220V is applied across a device X, a current of 0.5 A flows through thecircuit and is in phase with the applied voltage. When the same voltage is applied across another deviceY, the same current again flows through the circuit but it leads the applied voltage by `pi'/'2` radians.(a) Name the devices `X and Y.`(b) Calculate the current flowing in the circuit when same voltage is applied across the seriescombination of `X and

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If the bar magnet in exercise 13 is turned around by 180°, where will the new null points be

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Explain: The hysteresis loop of a soft iron piece has a much smaller area than that of a carbon steel piece. If the material is to go through repeated cycles of magnetisation, which piece will dissipate greater heat

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Two identical current carrying coaxial loops, carry current I in an opposite sense. A simple amperian loop passes through both of them once. Calling the loop as

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Two point charges `+8 q and -2q` are located at `x=0 and x=L`, respectively. The location of a point on the X-axis at which the net electric field due to these two point charges is zero,

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

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Two plates each having an area A are kept parallel to each other at a short distance `d`. They carry charges `+Q and -Q` respectively. The electric field in the space between the plates will

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

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Two equal and opposite charges `[+q and —q)` are situated at a distance `x` from each other. The value of potential at very far point will depend

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

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An electric field of 1000 V/m is applied to an electric dipole at angle of 45°. The value of electric dipole moment is `10^(-29) C-m`. What is the potential energy of the electric

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

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Electrostatic Potential Energy Electrostatic potential energy of a system of point charges is defined as the total amount of work done in bringing the different charges to their respective positions from infinitely large mutual separations.By definition, work done in carrying charge from `oo` to any point is W = Potential `xx` ChargeThis work is stored in the system of two point charges in the form of electrostatic potential energy U of the system.Work done in moving a charge from one point to other inside a uniformly charged conducting sphere

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The plot represents the flow of current through a wire at three different timesThe ratio of charges flowing through the wire at different times

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

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