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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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In a moving coil galvanometer, the deflection of the coil `theta` is related to ele. current I by the

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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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A Loop carrying current I lies in XY - plane as shown in the figure. The unit vector `hatk` is comming out of the plane of the paper. The magnetic moment of the current Loop

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

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A coil having N turns is wound tightly in the form of a spiral with inner and outer radii 'a' and 'b' respectively. When a current I passes through the coil, the magnetic field at the centre is

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

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A particle of mass m and charge q moves with a constant velocity `v` along the positive x - direction. It enters a region containing a uniform magnetic field B directed along the negative z-direction, extending from x = a to x = b. The minimum value of required so that the particle can just enter the region x > b

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

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An electron moving with a speed along the positive x-axis at y = 0 enters a region of uniform magnetic field `vecB= Bohatk` which exists to the right of y - axis. The electron exits from the region after some time with the speed at co-ordinate y

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

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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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When any coil is placed in a uniform mag. field torque is acting on it. The graph of `tau to theta`

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Graph of force per unit length between two long parallel current carrying conductors and the distance between them is

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An infinitely long hollow conducting cylinder with inner radius `R/2` and outer radius R carries a uniform current density along its length. The magnitude of the magnetic field `|vecB|` as a function of the radial distance r from the axis is best represented

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

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A charge Q is uniformly distributed over the surface of non-conducting disc of radius R. The disc rotates about an axis perpendicular to its plane and passing tarough its centre with an angular velocity co. As a result of this rotation a magnetic field of induction B is obtained at the centre of the disc. If we keep both the amount of charge placed on the disc and its angular velocity to be constant and vary the radius of the disc then the variation of the magnetic induction at the centre of the disc will be represented by the

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

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For substances hysteresis B-H curves are given as shown in the figure. For making temporary magnet which of the following group is

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A curve between magnetic moment and temperature of magnet

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

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The variation of magnetic suceptibility `(chi)` with mognetising field for a paramognetic substance

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The variation of magnetic suceptibility `(chi)` with absolute temperature T for a termomagnetic material

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The variation of the intensity of magnetisation (I) with respect to the magnetising field (H) in a diamagnetic substance is described by the

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The most appropriate magnetization `Mto` magnetising field H curve for a paramagnetic substance

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