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A current-carrying circular loop is located in a uniform external magnetic field. If the loop is free to turn, what is its orientation of stable equilibrium? Show that in this orientation, the flux of the total field (external field + field produced by the loop) is

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

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(i) A circular coil of 30 turns and radius 8.0 cm carrying a current of 6.0 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.0 T. The field lines make an angle of 60° with the normal of the coil. Calculate the magnitude of the counter torque that must be applied to prevent the coil from turning with the normal of the coil. Calculate the magnitude of the counter torque that must be applied to prevent the coil from turning.(ii) Would your answer change, if the circular coil in (a) were replaced by a planar coil

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

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A bar magnet of magnetic moment m and moment of inertia I (about centre, perpendicular to length) is cut into two equal pieces, perpendicular to length. Let T be the period of oscillations of the original magnet about an axis through the mid point, perpendicular to length, in a magnetic field B. What would be the similar period T′ for each

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

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Two point charges `A and B`, having charges `+Q and -Q` respectively, are placed at certain distance apart and force acting between them is `F` . If 25% charge of A is transferred to B, then force between the charges

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

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Equipotential SurfaceIn physics, the region in space where every point in it is at the same potential, is called equipotential or isopotential. An equipotential region of a scalar potential in three-dimensional space is often an equipotential surface, but it can also be a three-dimensional region in space. The gradient of the scalar potential is everywhere perpendicular to the equipotential surface, and zero inside a three-dimensional equipotential region. In case of electrical conductors, if a and b are any two points within or at the surface of a given conductor, and given there is no flow of charge being exchanged between

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

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The current in a wire varies with time according to the equation `i=4+ 2t`, where `i` is in ampere and `t` is in second. The quantity of charge which passes through a cross-section of the wire during the time `t= 2 s` to `t = 6 s`

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

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A thin convex lens of focal length 25 cm is cut into two pieces 0.5 cm above the principal axis. The top part is placed at (0,0) and an object placed at (–50 cm, 0). Find the coordinates of the

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

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Answer the following questions: As you have learnt in the text, the principle of linear superposition of wave displacement is basic to understanding intensity distributions in diffraction and interference patterns. What is the justification of this

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

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What is the de Broglie wavelength associated with a ball of mass 150 g travelling at 30.0

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

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(a) Define photoelectric work function? What is its unit?(b) In a plot of photoelectric current versus anode potential, how does(i) Saturation current varies with anode potential for incident radiations of different frequencies but same intensity?(ii) The stopping potential varies for incident radiations of different intensities but same frequency.(iii) Photoelectric current vary for different intensities but same frequency of radiations? Justify your answer in each

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

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Which physical quantity has its S.I unit (1) Cm (2)

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

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A particle is situated at `x = 3` units at `t = 0`. It starts moving from rest with a constant acceleration of `4 ms^(-2)`. The position of the particle at `t = 3 s`

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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If Nine particles have speeds of 5, 8, 12, 12, 12, 14, 14, 17 and 20 m/s. find :→1) the average speed2) the Most Probable speed3) the r.m.s. Speed of the

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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The dimensions of an atom are of the order of an Angstrom. Thus there must be large electric fields between the protons and electrons. Why, then is the electrostatic field inside a conductor

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

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If the total charge enclosed by a surface is zero, does it imply that the elecric field everywhere on the surface is zero? Conversely, if the electric field everywhere on a surface is zero, does it imply that net charge inside is

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

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In a region of uniform magnetic induction `B = 10^(-2)` tesla, a circular coil of radius 30 cm and resistance ` π^2` ohm is rotated about an axis which is perpendicular to the direction of B and which forms a diameter of the coil. If the coil rotates at 200 rpm the amplitude of the alternating current induced in the coil

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

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Calculate the impedance of the circuit shown in the

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

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If the magnetic field is parallel to the positive y-axis and the charged particle is moving along the positive x-axis (Fig. ), which way would the Lorentz force be for a proton (positive

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

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A straight wire of mass 200 gm and length 1.5 meter carries a current of 2 Amp. It is suspended in mid-air by a uniform horizontal magnetic field B. [take g = 10 m/`s^2` ]. The B is

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

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Assertion: If a dipole is enclosed by a surface, then according to Gauss’s law, electric flux linked with it will be zero. Reason: The charge enclosed by a surface is

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

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