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A charged particle of charge e and mass m is moving in an electric field E and magnetic field B. Construct dimensionless quantities and quantities of dimension [T

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A He nucleus makes a full rotation in a circle of radius 0.8 meter in 2 sec. The value of the mag. field B at the centre of the circle will be ...................

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A conducting rod of 1 meter length and 1 kg mass is suspended by two vertical wires through its ends. An external magnetic field of 2 Tesla is applied normal to the rod. Now the current to be passed through the rod so as to make the tension in the wires zero is [take g = 10

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Two concentric coils each of radius equal to `2pi` cm are placed at right angles to each other. 3 Amp and 4 Amp are the currents flowing in each coil respectively. The magnetic field intensity at the centre of the coils will be ........................

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A long solenoid has 800 turns per meter length of solenoid. A current of 1.6 Amp flowsthrough it. The magnetic induction at the end of the solenoid on its axis is

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A magnetic field existing in a region is given by `B=Bo[1+x/l]hatk` . A square Loop of side l and carrying current I is placed with edges (sides) parallel to X-Y axis. The magnitude of the net magnetic force experienced by the Loop is

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A particle of mass m and charge q moves with a constant velocity `v` along the positive x - direction. It enters a region containing a uniform magnetic field B directed along the negative z-direction, extending from x = a to x = b. The minimum value of required so that the particle can just enter the region x > b

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A magnet of length 0.1 m and pole strength `10^(-4)` A.m. is kept in a magnetic field of 30 tesla at an angle of `30^0` . The couple acting on it is ...................` xx10^(-4)`

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An infinite line charge produces a Field of `18 xx 10^4` N/C at `0.02 m`. The linear charge density

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Assertion: No work is done in moving a charge along equatorial line. Reason: The electric potential is everywhere zero on the equatorial line of a

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Assertion: If the distance between parallel plates of a capacitor is halved and dielectric constant is made three times, then the capacitance becomes 6 times. Reason: Capacity of the capacitor depends upon the nature of the material between the

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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

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Dielectrics Dielectrics are insulating (non-conducting) materials that can produce electric effect without conduction. Movement of free charges is not possible in a dielectric, so they behave differently.When a dielectric material is kept in an electric field, then the external field induces dipole moment. Due to which, net charges on the surface of the dielectric appears.When a dielectric material is kept in an external field, then the induced field will

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Dielectrics Dielectrics are insulating (non-conducting) materials that can produce electric effect without conduction. Movement of free charges is not possible in a dielectric, so they behave differently.When a dielectric material is kept in an electric field, then the external field induces dipole moment. Due to which, net charges on the surface of the dielectric appears.In the absence of electric field, the net dipole moment of a polar dielectric

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

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Dielectrics Dielectrics are insulating (non-conducting) materials that can produce electric effect without conduction. Movement of free charges is not possible in a dielectric, so they behave differently.When a dielectric material is kept in an electric field, then the external field induces dipole moment. Due to which, net charges on the surface of the dielectric appears.The SI unit of dielectric strength

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Assertion: Terminal voltage of a cell is greater than emf of cell during charging the cell. Reason: The emf of a cell is always greater than its terminal

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EMF of a CellAn electric cell is a source of energy that maintains a continuous flow of charge in a circuit. It changes chemical energy into electrical energy. It has two electrodes, positive electrode and negative electrode as shown below.Electric cell has to do some work in maintaining the current through a circuit. The work done by the cell in moving unit positive charge through the whole circuit (including the cell) is called the electromotive force (emf) of the cell. When two electrodes (positive and negative) of a cell are immersed in an electrolytic solution, the charges are exchanged

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Commercial Electrical EnergyAn electrical appliance uses a lot of electric energy when it is operated e.g., geysers heaters etc. The electrical energy consumed is dependent on the time for which a specific appliance of fixed power rating is used. However, the energy used in hour is denoted as `1 kWh=3.6 xx 10^6` joule. This is represented as 1 unit. Different electrical appliance have difference power consumption which is mentioned on the device clearly.Two electric bulbs P and Q having resistances ratio 1 : 2 will consume power in the

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

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Wheatstone Bridge In 1845 by German physicist Gustav Kirchhoff described Kirchhoff’s circuit laws which are two equalities that deal with the current and potential difference (commonly known as voltage) in the lumped element model of electrical circuits.As an application of these laws, consider the circuit shown below, which is called the Wheatstone bridge. This bridge consists of four resistors `R_1, R_2, R_3 and R_4`. Across one pair of diagonally opposite points (A and C in the figure) a source is connected.This (i.e., AC) is called the battery arm. Between the other two vertices, B and Z), a galvanometer G (which

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A small circular flexible loop of wire of radius `r` carries a current `I`. It is placed in a uniform magnetic field B. The tension in the loop will be doubled, if .......... is

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

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