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A charged rod is brought near a negatively charged pith ball electroscope. What conclusion would you draw about the charge on the rod if pith ball moves away from the rod ?

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By how many ways we can charge a body?

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In the LCR circuit shown in Fig , the ac driving voltage is `v = V_m sin ωt`. At t = t0, the voltage source stops and R is short circuited. Now write down how much energy is stored in each of L and

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A bar magnet is moving along the common axis of two coils A &B towards A. current is induced

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The resistance of a coil for dc is in ohms. In ac, the

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An alternating current of frequency 'f' is flowing in a circuit containing a resistance R and a choke L in series.The impedance of this circuit

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Two identical incandesant light bulbs are connected as shown in figure. when the circuit is an AC voltage source of frequency f, which of the following observations will be

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Two concentric co-planar circular Loops of radii `r_1` and `r_2` carry currents of respectively I1 and I2 in opposite directions. The magnetic induction at the centre of the Loops is half that due to I1 alone at the centre. If `r_2 = 2r_1` the value of `I_2/ I_1`

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A ,B and C are three points in a uniform electric field, the electric potential

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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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Gauss Law in Magnetism We can write Gauss’s law for magnetostatics as `intB.dA=mu_0m`, where, `intB •dA`. is the magnetic flux and m is the net magnetic pole strength inside a closed surface. It was found that, magnetic flux through a closed surface is always zero, thus we reach at a conclusion that magnetic monopoles do not exist. A bar magnet always attain north-south poles no matter how many times it is cut into pieces.The net magnetic flux due to a bar magnet over a closed surface

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

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A square loop is symmetrically placed between two infinitely long current carrying wires in the same direction. Magnitude of currents in both the wires are same. Now, match the Column I with Column II and select the correct answer from the codes given below Column I Column II A. Loop is moved p. Induced current towards right in the loop is clockwise. B. Loop is moved q. Induced current towards left in the loop is anti-clockwise. C. Wire-1 is r. Power in the moved towards loop is zero. left

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

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Faraday’s Laws According to the Faraday’s first law, whenever the amount of magnetic flux linked with a circuit changes, an emf is induced in it. Induced current is determined by the rate at which the magnetic flux changes.Mathematically, the magnitude of the induced emf in a circuit is equal to the rate of change of magnetic flux through the circuit.Induced emf `prop` Rate of change of magnetic fluxThe flux linked with a circuit is given by `phi=t^3+3t-7`. The graph between time (X-axis) and induced emf (Y-axis) will be

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

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A card sheet divided into squares each of size 1 mm2 is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 9 cm) held close to the eye. What should be the distance between the object and the magnifying

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Consider a ray of light incident from air onto a slab of glass (refractive index n) of width d, at an angle θ. The phase difference between the ray reflected by the top surface of the glass and the bottom surface is

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The numbers `5.355 and 5.345` on rounding off to 3 significant figures will

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

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Charging by conduction is possible in

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

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When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain how this observation is consistent with the law of conservation of

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

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The Electric flux through the

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A loop, made of straight edges has six corners at A(0,0,0), B(L,O,0) C(L,L,0), D(0,L,0) E(0,L,L) and F(0,0,L). A magnetic field ` B=B_o( hati +hat k)T` is present in the region. The flux passing through the loop ABCDEFA (in that order)

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

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