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A choke coil

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Must every magnetic configuration have a north pole and a south pole? What about the field due to a

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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

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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

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Electric Charges The physical property of matter that causes it to experience a force when placed in an electromagnetic field is called electric charge. Electric charge is a characteristic that accompanies fundamental particles, wherever they exist. The process of charging a neutral body by bringing a charged body nearby it without making contact between the two bodies is known as charging by induction.Figures given below are showing the sequential steps of charging a conductor permanently by using the process of charging by induction.The value of charge on a body which carries 30 excess electrons

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

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Charge between Parallel Plates Surface charge density is defined as the charge per unit surface area of surface charge distribution, `i.e. sigma = (dq)/(dS)`Two large, thin metal plates are parallel and close to each other. On their inner faces, the plates have surface charge densities of opposite signs having magnitude of `17.0 xx 10^(-22) Cm^(-2)` as shown belowThe intensity of electric field at a point is `E=(sigma)/(epsilon_0)`where, `epsilon_0` = permittivity of free space`E` in the outer region of the first plate

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

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An electron of charge `e` moves in a circular orbit of radius `r` around the nucleus at a frequency `v`. The magnetic moment associated with the orbital motion of the electron

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

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What is the Fresnel's distance? For what distance is ray optics a good approximation when the aperture is 3 mm wide and the wavelength is 500

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For a given K.E. which of the following has the smallest de–broglie wavelength: electron, proton, α − particle

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Two point charges +q and +9q are separated by a distance of 10 a. Find the point on the line joining the two changes where electric field is

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

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Which of the following functions of time represent (a) simple harmonic, (b) periodic but not simple harmonic, and (c) non-periodic motion? Give period for each case of periodic motion (ω is any positive constant):

asked Mar 20, 2022 in 11th Physics by varun (6.7k points)

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If 109 electrons move out of a body to another body every second, how much time is required to get a total charge of 1 C on the other

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ODBAC is a fixed rectangular conductor of negilible resistance (CO is not connnected) and OP is a conductor which rotates clockwise with an angular velocity ω (Fig ). The entire system is in a uniform magnetic field B whose direction is along the normal to the surface of the rectangular conductor ABDC. The conductor OP is in electric contact with ABDC. The rotating conductor has a resistance of λ per unit length. Find the current in the rotating conductor, as it rotates by

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

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An inductor of reactance 1 Ω and a resistor of 2 Ω are connected in series to the terminals of a 6 V (rms) a.c. source. The power dissipated in the circuit

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When an AC voltage of 220 V is applied to the capacitor

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An emf of 15 V is applied in a circuit containing 5H inductance & `10 Omega` resistance. The ratio of the currents at time `t=oo` and at t =

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

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An alternating voltage is represented as `E = 20 sin 300t`. The average value of voltage over one cycle will

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What is the inductive reactance of a coil if the current through it is 20 mA and voltage across it is 100

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Calculate the impedance of the circuit shown in the

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A compass needle free to turn in a horizontal plane is placed at the centre of circular coil of 30 turns and radius 12 cm. The coil is in a vertical plane making an angle of 45° with the magnetic meridian. When the current in the coil is 0.35 A, the needle points west to east.(i) Determine the horizontal component of the earth’s magnetic field at the location.(ii) The current in the coil is reversed, and the coil is rotated about its vertical axis by an angle of 90° in the anticlockwise sense looking from above. Predict the direction of

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

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