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A system has two charges `q_A=2.5×10^(–7) C and q_B = – 2.5 × 10^(–7) C` located at points `A: (0, 0, – 0.15 m) and B ; (0, 0, + 0.15 m)` respectively. What is the total charge and electric dipole moment of the

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For a spherically symmetrical charge distribution, electric field at a distance r from the centre of sphere is `vecE=kr^7hatr`, where k is a constant. What will be the volume charge density at a distance r from the centre of sphere

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Four charges are placed at the circumference of a dial clock as shown in figure. If the clock has only hour hand, then the resultant force on a charge `q_0` placed at the centre, points in the direction which shows the time as

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The inward and outward electric flux for a closed surface in units of `Nm^2` /C are respectively `8 xx10^3` and `4 xx10^3` . Then the total charge inside the surface is ...........

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

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When 100 volt dc is applied across a coil, a current of 1A flows through it. When 100 volt ac at 50 cyle `s^(-1)` is applied to the same coil, only 0.5 A current flows. The impedance of the coil

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Find out impedance of given

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Calculate impedance of the given circuit :

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A voltage of 10 V and frequency `10^3 Hz` is applied to `1/pi muF` capacitor in series with a resistor of `500Omega`. Find the power factor of the circuit and the power

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

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The radius of a coil decreases steadily at the rate of `10^(–2)` m/s. A constant and uniform magnetic field of induction `10^(–3) Wb'/'m^2` acts perpendicular to the plane of the coil. The radius of the coil when the induced e.m.f. in the coil is `1muV`, is

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

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A 3.0 cm wire carrying a current of 10 A is placed inside a solenoid perpendicular to its axis. The magnetic field inside the solenoid is given to be 0.27 T. What is the magnetic force on the

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

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A toroid has a core (non-ferromagnetic) of inner radius 25 cm and outer radius 26 cm, around which 3500 turns of a wire are wound. If the current in the wire is 11 A, what is the magnetic field(i) outside the toroid,(ii) inside the core of the toroid, (iii) in the empty space surrounded by the

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Answer the following questions: A magnetic field that varies in magnitude from point to point but has a constant direction (east to west) is set up in a chamber. A charged particle enters the chamber and travels undeflected along a straight path with constant speed. What can you say

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

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A straight horizontal conducting rod of length 0.45 m and mass 60 g is suspended by two vertical wires at its ends. A current of 5.0 A is set up in the rod through the wires.(i) What magnetic field should be set up normal to the conductor in order that the tension in the wires is zero?(ii) What will be the total tension in the wires if the direction of current is reversed keeping the magnetic field same as before? (Ignore the mass of the wires.) g = 9.8 ms–2

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

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A short bar magnet of magnetic moment m = 0.32 JT–1 is placed in a uniform magnetic field of 0.15 T. If the bar is free to rotate in the plane of the field, which orientation would correspond to its

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Why is diamagnetism, in contrast, almost independent of

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Is the permeability of a ferromagnetic material independent of the magnetic field? If not, is it more for lower or higher

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Explain: ‘A system displaying a hysteresis loop such as a ferromagnet, is a device for storing memory?’ Explain the meaning of this

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A Rowland ring of mean radius 15 cm has 3500 turns of wire wound on a ferromagnetic core of relative permeability 800. What is the magnetic field B in the core for a magnetising current of 1.2

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

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The magnetic field of Earth can be modelled by that of a point dipole placed at the centre of the Earth. The dipole axis makes an angle of 11.3° with the axis of Earth. At Mumbai, declination is nearly zero.

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

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A proton has spin and magnetic moment just like an electron. Why then its effect is neglected in magnetism of

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

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