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Consider the two idealized systems: (i) a parallel plate capacitor with large plates and small separation and (ii) a long solenoid of length L >> R, radius of cross-section. In (i) E is ideally treated as a constant between plates and zero outside. In (ii) magnetic field is constant inside the solenoid and zero outside. These idealised assumptions, however, contradict fundamental laws as

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

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S is the surface of a lump of magnetic

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Use (a) the Ampere’s law for H and (b) continuity of lines of B, to conclude that inside a bar magnet, lines of H run from the N pole to S pole,

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

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Show that a force that does no work must be a velocity dependent

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A current carrying loop consists of 3 identical quarter circles of radius R, lying in the positive quadrants of the x-y, y-z and z-x planes with their centres at the origin, joined together. Find the direction and magnitude of B at the

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

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An electron and a positron are released from (0, 0, 0) and (0, 0, 1.5R ) respectively, in a uniform magnetic field B = `B_0 hati` , each with an equal momentum of magnitude p = e BR. Under what conditions on the direction of momentum will the orbits be

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

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`BrarrR` graph. The mag. field B at a distance r from a long straight wire carrying a current varies with r as shown in

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

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As shown in Fig. there are two semicircles of radii `r_1 = 12 cm` and `r_2 = 10 cm` in which 4 Amp current is flowing The mag. field at the centre 'O' is

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

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A long horizontal wire 'A' carries a current of 50 Amp. It is rigidly fixed. Another small wire 'B' is placed just above and parallel to 'A'. The weight of wire-B per unit length is `75X10^(-3)` Newton/meter and carries a current of 25 Amp. Find the position of wire B from A so that wire B remains suspended due to magnetic repulsion. Also indicate the direction of current in B w.r.t. to

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

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A charged particle moves in a uniform mag. field. The velocity of the particle at some instant makes an acute angle with the mag. field. The path of the particle will

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

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The unit of ele. current 'AMPEAR' is the current which when flowing through each of two parallel wires spaced 1 meter apart in vaccum and of infinite length will give rise to a force between them equal to ....................

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

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The variation of mag. suceptibility `(chi)` with temperature for a diamagnetic substance is best represented

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

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The gaussian surface for calculating the electric field due to a charge distribution

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Flux coming out from a unit positive charge enclosed in air

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Assertion: Acceleration of charged particle in non-uniform electric field does not depend on velocity of charged particle. Reason: Charge is an invariant

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

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The energy required to charge a parallel plate condenser of plate separation `d` and plate area of cross-section A such that the uniform electric field between the plates `E`

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

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Two condensers `C_1 and C_2` in a circuit are joined as shown in figure. The potential of point A is `V_1` and that of B is `V_2` . The potential of point `D` will

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Choose the incorrect statement. Equipotential

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Assertion: Polar molecules do not have permanent dipole moment. Reason: In polar molecules, the centre of positive and negative charges coincides even when there is no external

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

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