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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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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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If a direct current of value a ampere is superimposed on an alternating current `I = b sinomegat` flowing through a wire, what is the effective value of the resulting current in the circuit

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Two plates of capacitors are at potentials `-10 V and +30 V`. If the separation between the plates be 2m, the electric field between them

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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

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

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A simple pendulum is suspended in a lift which is going up with an acceleration of `5 m'/'s^2` . An electric field of magnitude 5 N/C and directed vertically upward is also present in the lift . The charge of the bob is `1 muC` and mass is 1 mg . Taking `g=pi^2` and length of the simple pendulum 1m, find the time period of the simple pendulum (in

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

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Careful measurement of the electric field at the surface of a black box indicates that the net outward flux through the surface of the box is 8.0 × 103 `Nm^2`/C. If the net outward flux through the surface of the box were zero, could you conclude that there were

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

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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 and of magnitude 17.0 × 10–22 C/`m^2` . What is E:(i) in the outer region of the first plate,(ii) in the outer region of the second plate,(iii) between the

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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The horizontal component of the earth’s magnetic field at a certain place is 3.0 ×10–5 T and the direction of the field is from the geographic south to the geographic north. A very long straight conductor is carrying a steady current of 1A. What is the force per unit length on it when it is placed on a horizontal table and the direction of the current is(i) east to west;(ii) south to

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 spaceThe ratio of E from right side of plate B at distances 2 cm and 4 cm, respectively

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An air capacitor is charged with an amount of charge `q` and dipped into an oil tank. If the oil is pumped out, the electric field between the plates of capacitor

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

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Electrostatic Potential Energy Electrostatic potential energy of a system of point charges is defined as the total amount of work done in bringing the different charges to their respective positions from infinitely large mutual separations.By definition, work done in carrying charge from `oo` to any point is W = Potential `xx` ChargeThis work is stored in the system of two point charges in the form of electrostatic potential energy U of the system.Three charges are placed at the vertex of an equilateral triangle of side `l` as shown in figure. For what value of `Q` the electrostatic potential energy

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

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A spherically symmetric charge distribution is characterised by a charge density having the following variations: `rho(r)=rho_o (1-r/R)` for `r < R rho(r)=0` for `r ge R` Where r is the distance from the centre of the charge distribution p, is a constant. The electric field at an internal point (r < R)

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

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Which of the charges are possible?

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A solenoid is connected to a battery so that a steady current flows through it. If an iron core is inserted into the solenoid, will the current increase or decrease?

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

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A transformer of efficiency 90% draws an input power of 4 kW. An electrical applience connected across the secondary draws a current of 6 A.The impedence of device

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

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Two coils have a mutual inductance 0.005H The current changes in a coil according to equation `I = I_O sinomegat` Where `I_O = 10 A & ω= 100 π rad s^(-1)` The maximum value of emf in second coil

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

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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

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

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Match the Column I (AC circuit condition) with Column II (power dissipation) and select the correct answer from the codes given below. Column I Column II A. Resistive circuit p. No power dissipation B. Purely inductive or capacitive circuit q. Maximum power dissipation because of `X_C=X_L` C. L-C -R series circuit r. Power dissipated only in the resistor D. Power dissipated at resonance in L-C -R circuit s. Maximum power dissipation

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

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