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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

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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

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A metallic spherical shell has an inner radius R1 and outer radius R2. A charge Q is placed at the centre of the spherical cavity. What will be surface charge density on the inner

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A solenoid of 1.5 m long with inner diamter of 4 cm has three layers of windings of 1000 turns each & carries a current of 2 A. The magnetic flux through a cross section of the solenoid is

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In the following circuit the bulb will become suddenly bright

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At a given place the horizontal componnent of earth's field is 0.2 G. If a vertical wire carries a current of 30 Amp upward, what is the magnitude and direction of the force on 1 meter of wire

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A card sheet divided into squares each of size 1 mm2 is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 9 cm) held close to the eye. What is the magnification produced by the lens? How much is the

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What will be the effect on horizontal range of a projectile when its initial velocity is doubled, keeping the angle of projection

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

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An early model for an atom considered it to have a positively charged point nucleus of charge Ze, surrounded by a uniform density of negative charge up to a radius R. The atom as a whole is neutral. For this model, what is the electric field at a distance r from the

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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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An electron moves along the line AB,which lies in the same plane as a circular loop of conducting wires as shown in figure. What will be the direction of current induced if any, in the loop

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

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Two concentric co-planar circular Loops of radii `r_1` and `r_2` carry currents of respectively I1 and I2 in opposite directions. The magnetic induction at the centre of the Loops is half that due to I1 alone at the centre. If `r_2 = 2r_1` the value of `I_2/ I_1`

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.The dimensions of self-inductance L

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

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Define magnifying power of a telescope. Write its expression. A small telescope has an objective lens of focal length 150 cm and an eyepiece of focal length 5 cm. If this telescope is used to view a 100 m high tower 3 km away, find the height of the final image when it is formed 25 cm away from the

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

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Refer to the arrangement of charges in Fig. and a Gaussian surface of radius R with Q at the centre.

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

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In the LCR circuit shown in Fig , the ac driving voltage is `v = V_m sin ωt`. Write down the equation of motion for q

asked Mar 20, 2022 in 12th 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

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

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Electron Moving in Magnetic Field An electron with a speed `v_0 ( < < c)` moves in a circle of radius `r_0`, in a uniform magnetic field. This electron is able to travel in a circular path as magnetic field is perpendicular to the velocity of the electron. The time required for one revolution of the electron is `T_0`. The speed of the electron is now, doubled to `2v_0`.The time required for one revolution of the electron will change

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A charged particle of mass 1 kg and charge 2µc is thrown from a horizontal ground at an angle `theta = 45^o` with speed 20m/s. In space a horizontal electric field `E = 2 xx10^7 `V/m exist. The range on horizontal ground of the projectile thrown is ...............

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

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