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Electrostatic Potential Energy Electrostatic potential energy of a system of point charges is defined as the total amount of work done in bringing the different charges to their respective positions from infinitely large mutual separations.By definition, work done in carrying charge from `oo` to any point is W = Potential `xx` ChargeThis work is stored in the system of two point charges in the form of electrostatic potential energy U of the system.A positively charged particle is released from rest in an uniform electric field. The electric potential energy of the

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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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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Assertion: If we bend an insulating wire, the resistance of the wire increases.Reason: The drift velocity of electron in bended wire does not remains

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Commercial Electrical EnergyAn electrical appliance uses a lot of electric energy when it is operated e.g., geysers heaters etc. The electrical energy consumed is dependent on the time for which a specific appliance of fixed power rating is used. However, the energy used in hour is denoted as `1 kWh=3.6 xx 10^6` joule. This is represented as 1 unit. Different electrical appliance have difference power consumption which is mentioned on the device clearly.An electric heater consumes 1.5 kW power. If it used everyday for 2 hours, then electric energy used in January

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

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A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns/cm is halved, the new value of the magnetic field

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

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Four particles `alpha`-particle, deuteron, electron and a `Cl^-` ion enter in a transverse magnetic field perpendicular to it with same kinetic energy. Their paths are as shown in figure. Now, match the following two columns. Column I Column II A. Deuteron p. Path-1 B. `alpha`-particle q. Path-2 C. Electron r. Path-3 D. `Cl^-` s. Path-4

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

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The flux linked with a circuit is given by `phiB = t^2 +2`. 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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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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Assertion: The alternating current lags behind the emf by a phase angle of `pi'/'2`, when AC flows through an inductor. Reason: The inductive reactance increases as the frequency of AC source

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

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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.A power transmission line feeds input power at `2300 V` to a step-down transformer with its primary windings

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

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What is the focal length of a convex lens of focal length 30cm in contact with a concave lens of focal length 20cm? An object 1.5 cm in size is placed on the side of the convex lens in the arrangement above. The distance between the object and

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

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State the necessary conditions for producing total internal reflection of light. Draw ray diagrams to show how specially designed prisms make use of total internal reflection to obtain inverted image of the object by deviation of rays (i) through 90° and (ii) through

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

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(i) What are coherent sources? Why are they necessary for observing a sustained interference pattern? How are the two coherent sources obtained in the Young's double slit experiment? (ii) Show that the superposition of the waves originating from the two coherent sources, `S_1 and S_2` having displacement, `Y_1 = a cosomegat and Y_2 = a cos(omegat+phi)` at a point produce a resultant intensity, `I = 4a^2 cos^2 phi//2` Hence, write the conditions for the appearance of dark and bright

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Monochromatic light of frequency 6.0 ×1014 Hz is produced by a laser. The power emitted is 2.0 ×10–3 W. How many photons per second, on an average, are emitted by the

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The work function of caesium metal is 2.14 eV. When light of frequency 6 ×1014Hz is incident on the metal surface, photoemission of electrons occurs. What is the(i) maximum kinetic energy of the emitted electrons,(ii) Stopping potential,(iii) maximum speed of the emitted

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

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In an experiment on photoelectric effect, the slope of the cut-off voltage versus frequency of incident light is found to be 4.12 × 10–15 V s. Calculate the value of Planck’s

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Derive an expression for debroglie wavelength of an

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Define threshold wavelength for photoelectric effect? Debroglie wavelength associated with an electron associated through a potential difference V isλ ? What will be the new wavelength when the accelerating potential is increase to

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

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Assume that the frequency of the radiation incident on a metal plate is greater than its threshold frequency. How will the following change, if the incident radiation is doubled?(1) Kinetic energy of electrons (2) Photoelectric

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

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