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If `oint_0^1 vec E cdot vec (ds)=0` over a surface,

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

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A device ‘X’ is connected to an a.c source. The variation of voltage, current and power in one complete cycle is shown in Fig . Identify the

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

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A thin semicircular conducting ring of radius R is falling in a magnetic field B. Which is in limited area as shown in figure. At the position MNQ,the speed of ring is `v` and the potential difference developed across the ring

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

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A coil of inductance 300 mH and resistance `2Omega` is connected to a source of voltage 2V. The current reaches half of its steady state value

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

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If `X_L = 50Omega and X_C = 40 Omega.` Calculate effective value of current in given

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

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For a circular coil of radius R and N turns carrying current I, the magnitude of the magnetic field at a point on its axis at a distance x from its centre is given by, B=`(mu_0IR^2N ) /(2(x^2+R^2)^(3/2))`(i) Show that this reduces to the familiar result for field at the centre of the coil.(ii) Consider two parallel co-axial circular coils of equal radius R, and number of turns N, carrying equal currents in the same direction, and separated by a distance R. Show that the field on the axis around the mid-point between the coils is uniform over a distance

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

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Electric charges `q, q ,-2q` are placed at the corners of an equilateral `Delta ABC` of side `l`. The magnitude of electric dipole moment of the system

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. A point charge of 2C is placed at centre of Faraday cage in the shape of cube with surface of 9 cm edge. The number of electric field lines passing through the cube

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

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A ray PQ is incident normally on the face AB of a triangular prism of refracting angle of 60° made of a transparent material of refractive index `2/sqrt3` as shown in the figure. Trace the path of the ray as it passes through the prism. Also, calculate the angle of emergence and angle of deviation.

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

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(i) With the help of a suitable ray diagram, derive the mirror formula for a concave mirror. (ii) The near point of a hypermetropic person is 50 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

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

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The direction of ray of light incident on a concave mirror is shown by PQ while directions in which the ray would travel after reflection is shown by four rays marked 1, 2, 3 and 4 (Fig ). Which of the four rays correctly shows the direction of reflected

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

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State briefly two features which can distinguish the characteristic features of an interference pattern from those observed in the diffraction pattern due to a single

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

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An electric dipole when held at `30^0` with respect to a uniform electric field of `10^4 N/C` experienced a Torque of `9 x 10^(-26) Nm`. Calculate dipole moment 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

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

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Define these for a body in SHM

asked Mar 20, 2022 in 11th Physics by varun (6.7k points)

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Sketch the electric field lines for a uniformly charged hollow cylinder shown in Fig

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

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When an AC voltage of 220 V is applied to the capacitor

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

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A conducting rod PQ of length `4l` is rotated about a point O in a uniform magnetic field `vecB . PO=l`

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

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An emf of 15 V is applied in a circuit containing 5H inductance & `10 Omega` resistance. The ratio of the currents at time `t=oo` and at t =

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

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Alternating current can not be measured by dc ammeter

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

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