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A 60 W load is connected to the secondary of a transformer whose primary draws line voltage. If a current of 0.54 A flows in theload, what is the current in the primary coil? Comment on the type of transformer being

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For an LCR circuit driven at frequency ω, the equation reads`L (dl)/(dt)+Ri+q/c= V_i= V_m sinωt` Intergrate the equation over one cycle to find that the phase difference between V and i must be

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

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An alternating current of rms valuve 10 A is passed through a `12_Omega` resistance. The maximum potential difference across the resistor

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

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The value of alternating emf E in the given ckt will

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An alternating voltage `E=200sqrt 2 sin (100t)` is connected to 1 microfarad capacitor through an ac ammeter. The reading of the ammeter shall

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

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Find the time required for 50Hz alternating current to change its value from zero to rms

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

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In given circuit applied voltage `V = 50sqrt2 sin 100pit` volt and ammeter reading is 2A then calculate value of

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If power factor of a R-L series circuit is `1/2` when applied voltage is `V = 100 sin 100pit` volt and resistance of circuit is `200Omega` then calculate the inductance of the

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

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A uniform magnetic field of 1.5 T exists in a cylindrical region of radius10.0 cm, its direction parallel to the axis along east to west. A wire carrying current of 7.0 A in the north to south direction passes through this region. What is the magnitude and direction of the force on the wire if,(i) the wire intersects the axis,(ii) the wire is turned from N-S to northeast-northwest direction,(iii) the wire in the N-S direction is lowered from the axis by a distance of 6.0

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

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The diagrams given in Fig. show magnetic field lines (thick lines in the figure) wrongly. Point out what is wrong with them.

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

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The diagrams given in Fig. show magnetic field lines (thick lines in the figure) wrongly. Point out what is wrong with them.

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

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The diagrams given in Fig. show magnetic field lines (thick lines in the figure) wrongly. Point out what is wrong with them.

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

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A short bar magnet placed with its axis at 30° with a uniform external magnetic field of 0.25 T experiences a torque of magnitude equal to 4.5 × 10–2 J. What is the magnitude of magnetic moment of the

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

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Why does a paramagnetic sample display greater magnetisation (for the same magnetising field) when

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

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Explain: The hysteresis loop of a soft iron piece has a much smaller area than that of a carbon steel piece. If the material is to go through repeated cycles of magnetisation, which piece will dissipate greater heat

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

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Verify the Gauss’s law for magnetic field of a point dipole of dipole moment m at the origin for the surface which is a sphere of radius

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

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What are the dimensions of χ, the magnetic susceptibility? Consider an H-atom. Guess an expression for χ, upto a constant by constructing a quantity of dimensions of χ, out of parameters of the atom: e, m, v, R and 0 μ . Here, m is the electronic mass, v is electronic velocity, R is Bohr radius. Estimate the number so obtained and compare with the value of χ ~10–5 for many solid

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

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A circular current loop of magnetic moment M is in an arbitrary orientation in an external magnetic field B. The work done to rotate the loop by 30° about an axis perpendicular to its plane

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

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A cubical region of space is filled with some uniform electric and magnetic fields. An electron enters the cube across one of its faces with velocity v and a positron enters via opposite face with velocity- v. At this

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

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A multirange voltmeter can be constructed by using a galvanometer circuit as shown in Fig. We want to construct a voltmeter that can measure 2V, 20V and 200V using a galvanometer of resistance 10Ω and that produces maximum deflection for current of 1 mA. Find R1, R2 and R3 that have to be

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

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