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There are 50 turns / cm in a long solenoid. If 4 Amp current is flowing in the solenoid, the approximate value of mag. field along its axis at an internal point and one end will be

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Faraday Cage A Faraday cage or Faraday shield is an enclosure made of a conducting material. The fields within a conductor cancel out with any external fields, so the electric field within the enclosure is zero.These Faraday cages act as big hollow conductors. You can put things to shield them from electrical fields. Any electrical shocks the cage receives, pass harmlessly around the outside of the cage. What is the electrical force inside a Faraday cage, when it is struck by

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Draw a ray diagram to show the image formation by a concave mirror. When the object is kept between its forms and the pole. Using this diagram, derive the magnification formula for the image

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Mention one physical process for the release of electron from the surface of a

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Obtain the expression for the maximum kinetic energy of the electrons emitted from a metal surface in terms of the frequency of the incident radiation and the threshold

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Define one

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A block having mass `m = 4 kg` and charge `q=50 muC` is connected to a spring having a force constant `k=100 N'/'m`. The block lies on a frictionless horizontal track and a uniform electric field `E=5×10^5` V/m acts on the system as shwon in figure. The block is released from rest when the spring is unstretched (at `x = 0`) (a) By what maximum amount does the spring expand? (b) What is the equilibrium position of the block? (c) Show that the block's motion is simple harmonic and determine the amplitude and time period of the

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

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A ball of mass 1 gm and charge `10^(–8) c` moves from a point A, where the potential is 600 volt to the point B where the potential is zero. Velocity of the ball of the point B is 20cm/s. The velocity of the ball at the point A will be

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A cubical block of iron 5cm on each side is floating on mercury in a vessel:-1) What is the height of the block above mercury level?2) Water is poured into vessel so that it just covers the iron block. What is the height of the water column?Given Density of mercury = 13.6g|`cm^3` and Density of iron =

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Show that given equations are in SHM

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How many protons are there in

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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 outer

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A metal plate is getting heated. It can be

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1MW power is to be delivered from a power station to a town 10 km away. One uses a pair of Cu wires of radius 0.5 cm for this purpose. Calculate the fraction of ohmic losses to power transmitted if a step-up transformer is used to boost the voltage

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An alternating voltage is represented as `E = 20 sin 300t`. The average value of voltage over one cycle will

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An LC circuit contains a 20mH inductor and a `50muF` capacitor with an initial charge of 10mC. The resistance of the circuit is negligible. Let the instant the circuit is closed to be `t = 0.`What is the natural frequency of the

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The emf across `AB` at `t=l/(2v)` isA conducting square wire frame ABCD of side `l` is pulled by horizontal force so that it moves with constant velocity v. A uniform magnetic field of strength B is existing perpendicular to the plane of wire. The resistance per unit length of wire is `lambda` and negligible self inductance. If at `t= 0,` frame is just at the boundary of magnetic field.

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A solenoid of length 0.5 m has a radius of 1 cm and is made up of 500 turns. It carries a current of 5 A. What is the magnitude of the magnetic field inside the

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

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Assertion: Electric field is always normal to equipotential surfaces and along the direction of decreasing order of potential. Reason: Negative gradient of electric potential is electric

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

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Capacitor A device that stores electrical energy in an electric field is known as to be capacitor. It is a passive electronic component with two terminals. It basically consists of two conductors separated by a non-conductive region. This non-conductive region can either be a vacuum or an electrical insulator material known as a dielectric from Coulomb’s law a charge on one conductor will exert a force on the charge carriers within the other conductor, attracting opposite polarity charge and repelling like polarity charges, thus an opposite polarity charge will be induced on the surface of the other conductor. The conductors

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

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