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Two charged spheres of radii R1 and R2 having equal surface charge density. The ratio of their potential is

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Two equal charges q are placed at a distance of 2a and a third charge -2q is placed at the midpoint. The potential energy of the system is

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A sphere of radius 1cm has potential of 8000 v, then energy density near its surfacewill be

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If an electron moves from rest from a point at which potential is 50 volt to another point at which potential is 70 volt, then its kinetic energy in the final state will be

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The coil of a choke in a

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In the adjoining circuit the voltmeter whose reading will be zero at resonance

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The reactance of capacitor is 20 ohm. What does it

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What will be its reactance if frequency of AC is

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In given circuit find out (i) impedance of circuit (ii) current in

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When 10V, DC is applied across a coil current through it is `2.5 A,` if `10V, 50 Hz A.C.` is applied current reduces to 2 A. Calculate reactance of the

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A conducting loop is kept so that its center lies at the origin of the coordinate system. A magnetic field has the induction B pointing along Z-axis as shown in the

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

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Answer the following questions: An electron travelling west to east enters a chamber having a uniform electrostatic field in north to south direction. Specify the direction in which a uniform magnetic field should be set up to prevent the electron from deflecting from its straight line

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A uniform magnetic field of 3000 G is established along the positive z-direction. A rectangular loop of sides 10 cm and 5 cm carries a current of 12 A. What is the torque on the loop in the different cases shown in Fig. What is the force on each case? Which case corresponds to stable

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A domain in ferromagnetic iron is in the form of a cube of side length 1µm. Estimate the number of iron atoms in the domain and the maximum possible dipole moment and magnetisation of the domain. The molecular mass of iron is 55 g/mole and its density is 7.9 g/cm3 . Assume that each iron atom has a dipole moment of 9.27×10–24 A

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Answer the following questions regarding earth’s magnetism: The angle of dip at a location in southern India is about 18°. Would you expect a greater or smaller dip angle in

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

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A coil in the shape of an equilateral triangle of side l is suspended between the pole pieces of a permanent magnet such that `vecB` is in plane of the coil. If due to a current I in the triangle a torque `tau` acts on it, the side l of the triangle is

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A uniform conducting wire ABC has a mass 10 gram. A 2 Amp current is flowing through it. The wire is kept in uniform magnetic field B = 2 tesla the acceleration of the wire will be

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The correct curve between the magnetic induction (B) along the axis of a long solenoid due to current flow 1 in it and distance x from one end

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The magnetic field due to a short magnet at a point on its axis at a distance x cm from the middle point of the magnet is 200 gauss. The magnetic field at a point on the neutral axis at a distance x cm from the middle of the magnet is .................

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A bar magnet having a magnetic moment of `2xx10^4jt^(-1)` is free to rotate in a horizontal plane. A horizontal magnetic field `B=6xx10^(-4)` Tesla exists in the space. The work done in taking the magnet slowly from a direction parallel to the field to a direction `60^0` from the field

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

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