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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 on them. Which of the two capacitors have higher capacitance? Give reason for your answer?

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

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If a point charge q is placed at one corner of a cube, what is the flux linked with the

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The line that draws power supply to your house from street

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How does the sign of the phase angle φ, by which the supply voltage leads the current in an LCR series circuit, change as the supply frequency is gradually increased from very low to very high

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A coil has an area of 0.05 m2 & it has 800 turns. It is placed perpendicularly in a magnetic field of strength , `4xx10^(–5) Wb/m^(-2)`. It is rotated through `90^o` in 0.1 sec. The average emf induced in the coil

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

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A square loop of side 5 cm being moved right at a constant speed `2cms^(-1)` .The front edge of it enters in magnetic field at t = 0.Fined the induced emf in the loop at t = 1s, 5s,

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

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The time constant of a LR circuit is 20 ms The circuit is connected at t = 0 and the steady state current is found to be 4A. Find the current at 80

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

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A line charge `lambda` per unit length is pasted uniformly onto the rim of a wheel of mass m and radius R. The wheel has light non–conducting spokes and is free to rotate about a vertical axis as shown in figure.A uniform magnetic field B exist as shown in figure. What is the angular velocity of the wheel when the field is suddenly switched off?Consider a conducting circular loop placed in a magnetic field as shown in figure. When magnetic field changes with time, magnetic flux also changes and emf `e=-(dphi)/(dt)` is induced. If resistance of loop is R then

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

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Five long wires A, B, C, D and E, each carrying current I are arranged to form edges of a pentagonal prism as shown in Fig. Each carries current out of the plane of paper. What will be the field if current in one of the wires

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

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Two parallel long straight conductors are placed at right angle to the meter scale at the 2 cm and 6 cm marks as shown in the figure. If they carry currents I and 3I respectively in the upward direction, then will produce zero magnetic field

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Assertion: Electric lines of force cross each other. Reason: Electric field at a point does not superimposes to give one resultant electric

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Charge between Parallel Plates Surface charge density is defined as the charge per unit surface area of surface charge distribution, `i.e. sigma = (dq)/(dS)`Two large, thin metal plates are parallel and close to each other. On their inner faces, the plates have surface charge densities of opposite signs having magnitude of `17.0 xx 10^(-22) Cm^(-2)` as shown belowThe intensity of electric field at a point is `E=(sigma)/(epsilon_0)`where, `epsilon_0` = permittivity of free space`E` in the outer region of the second plate

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

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Faraday Cage A Faraday cage or Faraday shield is an enclosure made of a conducting material. The fields within a conductor cancel out with any external fields, so the electric field within the enclosure is zero.These Faraday cages act as big hollow conductors. You can put things to shield them from electrical fields. Any electrical shocks the cage receives, pass harmlessly around the outside of the cage. An isolated point charge `+q` is placed inside the Faraday cage. Its surface must have charge equal

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)

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

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The full scale deflection current of a galvanometer of resistance `1Omega` is `5 mA`. What is the value of resistance R, which is connected in series to convert it into a voltmeter of range `5

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A coil and a bulb are connected in series with a DC source, a soft iron core is inserted in the coil, then the intensity of the

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

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Eddy CurrentCoil is wound over metallic core is helpful in reducing eddy currents in the metallic cores of transformers, electric motors, induction furnaces and other such devices (as shown below). Eddy currents are undesirable since they heat up the core and dissipate electrical energy in the form of heat. These currents are minimised by using laminations of metal to make a metal core. The plane of the laminations must be arranged parallel to the magnetic field, so that

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Assume that light of wavelength 6000Å is coming from a star. What is the limit of resolution of a telescope whose objective has a diameter of 100

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Answer the following questions: Two students are separated by a 7 m partition wall in a room 10 m high. If both light and sound waves can bend around obstacles, how is it that the students are unable to see each other even though they can converse

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

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The wavelength of light in the visible region is about 390 nm for violet colour, about 550 nm (average wavelength) for yellowgreen colour and about 760 nm for red colour. What are the energies of photons in (eV) at the (i) violet end, (ii) average wavelength, yellow-green colour, and

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

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