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A circular coil of wire consisting of 100 turns, each of radius 8.0 cm carries a current of 0.40 A. What is the magnitude of the magnetic field B at the centre of the

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

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A convex lens of focal length 30 cm is placed coaxially with a convex mirror of radius of curvature 20 cm. The two are kept at 15 cm from each other. A point object lies 60 cm in front of the convex lens. Draw a ray diagram to show the formation of the image by the combination. Determine the nature and position of the image

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

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The distance of the field point on the equatorial plane of a small electric dipole is halved. By what factor will the electric filed

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

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Two point charges 100µc and 5µc are placed at points A and B respectively with AB = 40 cm. The work done by external force in displacing the charge 5µc from B to C where BC = 30 cm, angle `ABC = pi/ 2` and `1/(4piepsilon_o)=9xx 10^9 Nm^2' /'c^2`

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

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The electrostatic force on a small sphere of charge 0.4 µC due to another small sphere of charge –0.8 µC in air is 0.2 N. What is the force on the second sphere due to the

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

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Assertion: On going away from a small electric dipole, electric field decreases. Reason: Electric field is inversely proportional to square of distance from an electric

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

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Assertion: `E` in outside vicinity of a conductor depends only on the local charge density a and it is independent of the other charges present anywhere on the conductor. Reason: `E` in outside vicinity of a conductor is given by

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

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Give three properties of electric charge.?

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

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Two charges ±10 µC are placed 5.0 mm apart. Determine the electric field at a point Q, 15 cm away from O on a line passing through O and normal to the axis of the dipole, as shown in fig.

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

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In the following circuit the bulb will become suddenly bright

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

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If a conductor has a potential `V!=0` and there are no charges anywhere else outside,

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. When a high frequency alternating current is passed through a coil which surrounds the metal to be melted,

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

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Point charges 4µc and 2µc are placed at the vertices P and Q of a right angle triangle PQR respectively. Q is the right angle, `PR = 2 xx10^(-2) m` and `QR = 10^(-2) m` . The magnitude and direction of the resultant electric field at c is

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

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Match the Column I (quantities) with Column II (approximate values) and select the correct answer from the codes given below. Column I Column II A. Escape velocity of earth p. `1.6 m'/'s^2` B. Gravitational acceleration at moon’s surface q. `6400 km` C. Radius of earth r. `11.2 km'/'s`

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Two fixed, identical conducting plates (α & β ) , each of surface area S are charged to –Q and q, respectively, whereQ > q > 0. A third identical plate (γ ), free to move is located on the other side of the plate with charge q at a distance d (Fig ). The third plate is released and collides with the plate β . Assume the collision is elastic and the time of collision is sufficient to redistribute charge amongst β & γ . (i) Find the electric field acting on the plate γ before collision.(ii)

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

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Two different loops are concentric & lie in the same plane. The current in outer loop is clockwise & increasing with time. The induced current in the inner loop then,

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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A spring balance has a scale that reads from 0 to 50 kg. The length of the scale is 20 cm. A body suspended from this balance, when displaced and released, oscillates with a period of 0.6 s. What is the weight of the body

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A coil has a power factor of 0.866 at 60 Hz. What will be power factor at 180

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

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A positive charge +Q is fixed at a point A. Another positively charged particle of mass m and charge +q is projected from a point B with velocity u as shown in the figure. The point B is at the large distance from A and at distance d from the line AC. The initial velocity is parallel to the line AC. The point C is at very large distance from A. The minimum distance (in meter) of +q from +Q during the motion is `d (1+sqrtA)`. Find the value of A. [Take `Qq= 4πε_0 mu^2d and d=(sqrt2-1)`

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

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