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An ac source is rated at 220V, 50 Hz. The time taken for voltage to change from its peak value to zero

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An LCR series circuit with `R = 100Omega` is connected to a 200 V, 50 Hz a.c source when only the capacitance is removed the current lies the voltage by `60^0` when only the inductance is removed, the current leads the voltage by `60^0` . The current in the circuit

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If `E=500 sin (100 pit)` volt then calculate time taken to reach from zero to

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A loop of irregular shape carrying current is located in an external magnetic field. If the wire is flexible, why does it change to a circular

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A closely wound solenoid 80 cm long has 5 layers of windings of 400 turns each. The diameter of the solenoid is 1.8 cm. If the current carried is 8.0 A, estimate the magnitude of B inside the solenoid near its

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

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A magnetic field of 100 G (1 G = 10–4 T) is required which is uniform in a region of linear dimension about 10 cm and area of cross-section about 10–3 m2 . The maximum current-carrying capacity of a given coil of wire is 15 A and the number of turns per unit length that can be wound round a core is at most 1000 turns m–1. Suggest some appropriate design particulars of a solenoid for the required purpose. Assume the core is not

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If the solenoid in Exercise 5 is free to turn about the vertical direction and a uniform horizontal magnetic field of 0.25 T is applied, what is the magnitude of torque on the solenoid when its axis makes an angle of 30° with the direction of applied

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A paramagnetic sample shows a net magnetisation of 8 Am–1 when placed in an external magnetic field of 0.6T at a temperature of 4K. When the same sample is placed in an external magnetic field of 0.2 T at a temperature of 16K, the magnetisation will

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A circular loop of radius R = 20 cm is placed in a uniform magnetic field B = 2 Tesla in xy - Plane as shown in figure. The loop carries a current I = 1 Amp in the direction shown in fig. Find the magnitude of torque acting on the

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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

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Two unlike charges of the same magnitude `Q` are placed at a distance `d`. The intensity of the electric field at the centre of the line joining the two charges,

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

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Electric Field LinesAn electric field line in general is a curve drawn in such a way that the tangent to it at each point is in the direction of the electric field at that point. A field line is a space curve, i.e. a curve in three dimensions. Electric field lines are thus used to pictorially map the electric field around a charge or a configuration of charges.The density of field lines is more near the charge. Away from the charge, the field is weak, so the density of field lines is less.What kind of charges are of 1, 2

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The graph shows the variation of voltage `V` across the plates of two capacitors `A and B` versus increase of charge `Q` stored in them. Which of the capacitors has higher capacitance

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

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Proton in an Electric Field Potential difference `(DeltaV)` between two points `A and B` separated by a distance `x`, in a uniform electric field `E` is given by `DeltaV =-Ex`, where `x` is measured parallel to the field lines. If a charge `q_0` moves from A to B, the change in potential energy `(DeltaU)` is given as `DeltaU=q_0 DeltaV`. A proton is released from rest in uniform electric field of magnitude `8.0 xx 10^4 Vm^(-1)` directed along the positive X-axis. The proton undergoes a displacement of 0.50 m in the direction of E.Mass of a proton `= 1.66 xx 10^(-27)

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The heat produced by 100W heater in 2 min is equal

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If the magnet is cut into four equal parts, such that their lengths and breadths are equal, then pole strength of each part

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There are two long co-axial solenoids of same length `l`. The inner & outer coils have radii `r_1 & r_2` and number of turns per unit length `n_1 & n_2`, respectively. The ratio of mutual inductance to the self-inductance of the inner coil

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

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Assertion: Magnetic flux and the electric flux have the same units. Reason: Flux passing through a surface does not gives an idea about the field lines crossing that

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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 fluxOn the basis of Faraday’s law, current in the coil is

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

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Self-Induction Self-induction is the property of a coil by virtue of which the coil opposes any change in the strength of current flowing through it by inducing an emf in itself. This induced emf is also called back emf. When the current in a coil is switched ON, then the self induction opposes the growth of the current and when it is switch OFF, then the self-induction opposes the decay of the current.In 0.2s, the current in a coil increases from `1.5 A to 2.5 A`. If inductance of this coil is 60 mH, then induced current in an external

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

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