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An electric charge `q` is placed at one of the corners of a cube of side `a`. The electric flux on one of its faces will

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

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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 spaceIn order to estimate the electric field due to a thin finite plane metal plate, the gaussian surface considered

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

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A parallel plate capacitor is charged by a battery which is then disconnected. A dielectric slab is then inserted to fill the space between the plates. Match the changes that could occur with Column II. Column I Column II A. Charge on the capacitor plates p. Decrease by a factor of K B. Intensity of electric field q. Increase by a factor of K C. Energy stored r. Remains same D. Capacitance s. None

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

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Assertion: When two positive point charges move away from each other, then their electrostatic potential energy decreases. Reason: Change in potential energy between two points is equal to the work done by electrostatic

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

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The plot represents the flow of current through a wire at three different timesThe ratio of charges flowing through the wire at different times

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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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Assertion: If a moving charged particle enters into a region of magnetic field from outside, it does not complete a circular path. Reason: Power associated with the force exerted by a magnetic field on a moving charged particle is always equal to

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Assertion: For a current carrying wire loop of `N` turns, placed in a region of a uniform magnetic field B , the torque acting on it is given by `m xx B`. Reason: Whenever the magnetic moment m is perpendicular to B, then torque on the loop will be

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

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Magnetic Field of a SolenoidMohan tightly wound a very long copper wire on a PVC pipe and carefully took the pipe out. The two ends of the copper wire then attached to a battery. This cylindrical shape of copper wire showed few properties of a bar magnet. Later he found that it is called a solenoid and this solenoid is used in several devices such as door bell, relay switch etc. The magnetic field of a solenoid is given below.The magnetic field strength of a solenoid having n turns is `B=mu_0nl`, where, `I` is the current flowing in the solenoid.The

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

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Electron is revolving around a nucleus in circular orbit of radius `1 A` with a speed `4 xx 10^4` m/s. Magnetic moment produced due to rotation of electron

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

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Gauss Law in Magnetism We can write Gauss’s law for magnetostatics as `intB.dA=mu_0m`, where, `intB •dA`. is the magnetic flux and m is the net magnetic pole strength inside a closed surface. It was found that, magnetic flux through a closed surface is always zero, thus we reach at a conclusion that magnetic monopoles do not exist. A bar magnet always attain north-south poles no matter how many times it is cut into pieces.The number of magnetic field lines passing through a surface area normally is

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

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Gauss Law in Magnetism We can write Gauss’s law for magnetostatics as `intB.dA=mu_0m`, where, `intB •dA`. is the magnetic flux and m is the net magnetic pole strength inside a closed surface. It was found that, magnetic flux through a closed surface is always zero, thus we reach at a conclusion that magnetic monopoles do not exist. A bar magnet always attain north-south poles no matter how many times it is cut into pieces.The dimensional representation of magnetic flux density

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

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The figure shows certain wire segments joined together to form a co-planar loop. The loop is placed in a perpendicular magnetic field in the direction going into the plane of the figure. The magnitude of the field increases with time and `I_1 & I_2` are the currents in the segment `ab & cd`.

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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L-C Oscillations When a capacitor is supplied with an AC circuit, it gets charged.When this charged capacitor is connected with an inductor, current flows through inductor, giving rise to magnetic flux. Hence, induced emf is produced in the circuit. Due to this, the charge on the capacitor decreases and an equivalent amount of energy is stored in the inductor in the form of magnetic Field.The physical quantity that has same dimension as that of `sqrt(LC)`

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

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AC Generator An AC generator produces electrical energy from mechanical work, just the opposite of what a motor does. In it, a shaft is rotated by some mechanical means, such as an engine or a turbine starts working and an emf is induced in the coil.It is based on the phenomenon of electromagnetic induction which states that whenever magnetic flux linked with a conductor (or coil) changes, an emf is induced in the coil. An AC generator consists of a coil of 1000 turns and cross-sectional area of `100 cm^2`, rotating at an angular speed of 100 rpm in a

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.What is not possible in a

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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At what angle should a ray of light be incident on the face of a prism of refracting angle 60° so that it just suffers total internal reflection at the other face? The refractive index of the material of the prism is

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

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A man with normal near point (25 cm) reads a book with small print using a magnifying glass: a thin convex lens of focal length 5 cm. What is the maximum and the minimum angular magnification (magnifying power) possible using the above simple

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

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