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The Transformer Transformer is a device, which is used to increase or decrease the alternating voltage. The transformers are of the following types (i) Step-up transformer (ii) Step-down transformerTransformer is based upon the principle of mutual induction. It consists of two coils, primary coil `(p)` and secondary coil `(s)`, insulated from each other wounded on soft iron core.Often the primary coil is the input coil and secondary coil is the output coil. These soft iron cores are laminated to minimise eddy current loss.The ratio of secondary to primary turns in an ideal transformer is 4 : 5. If power input

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

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A block having mass `m = 4 kg` and charge `q=50 muC` is connected to a spring having a force constant `k=100 N'/'m`. The block lies on a frictionless horizontal track and a uniform electric field `E=5×10^5` V/m acts on the system as shwon in figure. The block is released from rest when the spring is unstretched (at `x = 0`) (a) By what maximum amount does the spring expand? (b) What is the equilibrium position of the block? (c) Show that the block's motion is simple harmonic and determine the amplitude and time period of the

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

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Two positrons `(e^+)` and two protons (p) are kept on four corners of a square of side a as shown in figure. The mass of proton is much larger than the mass of positron. Let q denotes the charge on the proton as well as the positron then the kinetic energies of one of the positrons and one of the protons respectively after a very long time will

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What is phase difference?

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A charged metallic sphere can charge another uncharged sphere

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The self inductance L of a solenoid of length l and area of crosssection A, with a fixed number of turns N increases

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The mutual inductance M12 of coil 1 with respect to coil

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As the frequency of an ac circuit increases, the current first increases and then decreases. What combination of circuit elements is most likely to comprise the

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Explain why A.C. is more dangerous than D.C.

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Magnetic flux in a circular coil of resistance `10Omega` changes with time as shown in figure. `ox` direction indicates a direction perpendicular to paper inwards. Column–I Column–II (A) At 1 second induced current is (P) Clockwise (B) At 5 second induced current is (Q) Anticlockwise (C) At 9 second induced current is (R) 0.5 A (D) At 15 second induced current is (S) 5 A (T) None of these

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

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A circular coil of 20 turns and radius 10 cm is placed in a uniform magnetic field of 0.10 T normal to the plane of the coil. If the current in the coil is 5.0 A, what is the(i) total torque on the coil,(ii) total force on the coil,m2(iii) average force on each electron in the coil due to the magnetic field? (The coil is made of copper wire of cross-sectional area 10–5 , and the free electron density in copper is given to be about 1029

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

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Magnetic field lines can be entirely confined within the core of a toroid, but not within a straight solenoid.

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Assertion: Electric field is always normal to equipotential surfaces and along the direction of decreasing order of potential. Reason: Negative gradient of electric potential is electric

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

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Capacitor A device that stores electrical energy in an electric field is known as to be capacitor. It is a passive electronic component with two terminals. It basically consists of two conductors separated by a non-conductive region. This non-conductive region can either be a vacuum or an electrical insulator material known as a dielectric from Coulomb’s law a charge on one conductor will exert a force on the charge carriers within the other conductor, attracting opposite polarity charge and repelling like polarity charges, thus an opposite polarity charge will be induced on the surface of the other conductor. The conductors

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

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The drift velocity of the electrons in a copper wire of length 2 m under the application of a potential difference of `220 V` is `0.5 ms^(-1)`. Their mobility (in `m^2 V^(-1)

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Ohm’s law in point form in field theory can be expressed

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Assertion: In the phenomenon of mutual induction, self-induction of each of the coils persists. Reason: Self-induction aries when strength of current in same coil changes. In mutual induction, current is changing in both the individual

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

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The near point of a hypermetropic person is 75 cm from the eye. What is the power of the lens required to enable the person to read clearly a book held at 25 cm from the

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Draw a ray diagram to show the image formation by a concave mirror. When the object is kept between its forms and the pole. Using this diagram, derive the magnification formula for the image

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What is the shape of the wavefront in each of the following cases: Light emerging out of a convex lens when a point source is placed at its

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