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Match the Column I (energy of capacitor) with Column II (value) and select the correct answer from the codes given below. A capacitor `C_1` of capacitance C is charged to a potential difference `V_0`. The terminals of the charged capacitor are then connected to an uncharged capacitor `C_2` of capacitance C/2. Column I Column II A. Final energy of capacitor `C_1` p.`-(1'/'6) CV_0^2` B. Final energy of capacitor `C_2` q.`(1'/'6) CV_0^2` C. Final energy of the system r. `(1'/'3) CV_0^2` D. Change in energy on joining the

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

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Find the position, nature,and magnification of the image. An object is placed at 5 cm in front of a concave mirror of radius of curvature 15

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

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Consider a ray of light incident from air onto a slab of glass (refractive index n) of width d, at an angle θ. The phase difference between the ray reflected by the top surface of the glass and the bottom surface is

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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A particle having a charge of `1.6xx 10^(-19) C` enters between the plates of a parallel plate capaciter. The initial velocity of the particle is parallel to the plates. A potential difference of 300v is applied to the capacitor plates. If the length of the capacitor plates is 10cm and they are separated by 2cm, Calculate the greatest initial velocity for which the particle will not be able to come out of the plates. The mass of the particle is `12xx 10^(-24) kg`

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

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Force of Friction on Connected Bodies When bodies are in contact, there are mutual contact forces satisfying the third law of motion. The component of contact force normal to the surfaces in contact is called normal reaction. The component parallel to the surfaces in contact is called friction.In the above figure, `8 kg and 6 kg` are hanging stationary from a rough pulley and are about to move. They are stationary due to roughness of the pulley.Coefficient of friction of the pulley

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

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A hollow charged conductor has a tiny hole cut into its surface. Show that the electric field in the hole is `(σ/2ε_0 )hatn` , where `hatn` is the unit vector in the outward normal direction, and σ is the surface charge density near the

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

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(i) Consider an arbitrary electrostatic field configuration. A small test charge is placed at a null point (i.e., where E = 0) of the configuration. Show that the equilibrium of the test charge is necessarily unstable.(ii) Verify this result for the simple configuration of two charges of the same magnitude and sign placed a certain distance

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

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If the total charge enclosed by a surface is zero, does it imply that the elecric field everywhere on the surface is zero? Conversely, if the electric field everywhere on a surface is zero, does it imply that net charge inside is

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

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When the number of turns in a coil is make four time without any change in length of the coil, its self inductance

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

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The resistance of a coil for dc is in ohms. In ac, the

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

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The rms value of an ac of 50 Hz is 10 amp.The time taken by the alternating current in reaching from zero to maximum value and the peak value of current will

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

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A coil of inductive reactance `31Omega` has a resistance of `8Omega` . It is placed in series with a condenser of copacitive reactance `25Omega` . The combination is connected to an a.c. source of 110 volt. The power factor of the circuit

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

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If the magnetic field is parallel to the positive y-axis and the charged particle is moving along the positive x-axis (Fig. ), which way would the Lorentz force be for an electron (negative

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

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A solenoid 60 cm long and of radius 4.0 cm has 3 layers of windings of 300 turns each. A 2.0 cm long wire of mass 2.5 g lies inside the solenoid (near its centre) normal to its axis; both the wire and the axis of the solenoid are in the horizontal plane. The wire is connected through two leads parallel to the axis of the solenoid to an external battery which supplies a current of 6.0 A in the wire. What value of current (with appropriate sense of circulation) in the windings of the solenoid can support the weight

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

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Equipotential SurfaceIn physics, the region in space where every point in it is at the same potential, is called equipotential or isopotential. An equipotential region of a scalar potential in three-dimensional space is often an equipotential surface, but it can also be a three-dimensional region in space. The gradient of the scalar potential is everywhere perpendicular to the equipotential surface, and zero inside a three-dimensional equipotential region. In case of electrical conductors, if a and b are any two points within or at the surface of a given conductor, and given there is no flow of charge being exchanged between

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.In an L-C circuit, angular frequency at resonance is `omega`. What will be the new frequency when inductor’s inductance is made two times and capacitor’s capacitance is made four

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

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(a) Define photoelectric work function? What is its unit?(b) In a plot of photoelectric current versus anode potential, how does(i) Saturation current varies with anode potential for incident radiations of different frequencies but same intensity?(ii) The stopping potential varies for incident radiations of different intensities but same frequency.(iii) Photoelectric current vary for different intensities but same frequency of radiations? Justify your answer in each

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

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Charging by conduction is possible in

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

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A wire of length 2m is moving at a speed `2ms^(-1)` keep its length perpendicular to uniform magnetic field of 0.5 T. The resistance of circuit joined with this wire is `6Omega`. The rate at which wolrk is being done to keep the wire moving at constant speed is

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

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