Hot questions

0 votes

0 answers

A long straight wire of radius 'a' carries a steady current I the current is uniformly distributed across its cross-section. The ratio of the magnetic field at a/2 and 2a is

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

0 votes

0 answers

The distance at which the magnetic field on axis as compared to the mag. field at the centre of the coil carrying current I and radius R is , `1/8` would

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

0 votes

0 answers

A long horizontal wire 'A' carries a current of 50 Amp. It is rigidly fixed. Another small wire 'B' is placed just above and parallel to 'A'. The weight of wire-B per unit length is `75X10^(-3)` Newton/meter and carries a current of 25 Amp. Find the position of wire B from A so that wire B remains suspended due to magnetic repulsion. Also indicate the direction of current in B w.r.t. to

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

0 votes

0 answers

A Galvanometer of resistance `50Omega` is connected to a battery of 3 volt along with a resistance of `2950Omega` in series. A full scale deflection of 30 divisions is obtained in the galvanometer. In order to reduce this deflection to 20 divisions, the resistance in series should

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

0 votes

0 answers

The unit of ele. current 'AMPEAR' is the current which when flowing through each of two parallel wires spaced 1 meter apart in vaccum and of infinite length will give rise to a force between them equal to ....................

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

0 votes

0 answers

A uniform conducting wire ABC has a mass 10 gram. A 2 Amp current is flowing through it. The wire is kept in uniform magnetic field B = 2 tesla the acceleration of the wire will be

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

0 votes

0 answers

The correct curve between the magnetic induction (B) along the axis of a long solenoid due to current flow 1 in it and distance x from one end

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

0 votes

0 answers

An iron rod of length L and magnetic moment M is bent in the form of a semi circle. Now its magnetic moment will

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

0 votes

0 answers

A bar magnet having a magnetic moment of `2xx10^4jt^(-1)` is free to rotate in a horizontal plane. A horizontal magnetic field `B=6xx10^(-4)` Tesla exists in the space. The work done in taking the magnet slowly from a direction parallel to the field to a direction `60^0` from the field

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

0 votes

0 answers

A small bar magnet of moment M is placed in a uniform field of H. If magnet makes an angle of `30^0` with field, the torque acting on the magnet

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

0 votes

0 answers

A comb runs through one’s dry hair attracts small bits of paper. This happens

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

0 votes

0 answers

Two point charges placed at a certain distance `r` in air exert a force `F` on each other. Then, the distance `r'` at which these charges will exert the same force in a medium of dielectric constant `K` is given

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

0 votes

0 answers

An electric dipole is placed in an uniform electric field with the dipole axis making an angle `theta` with the direction of the electric field. The orientation of the dipole for stable equilibrium

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

0 votes

0 answers

The gaussian surface for calculating the electric field due to a charge distribution

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

0 votes

0 answers

Three capacitors `3muF,6muF and 6 muF` are connected in series to a source of `120 V`. The potential difference (in volt) across the `3muF` capacitor will

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

0 votes

0 answers

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)

0 votes

0 answers

A battery of emf E has an internal resistance r. A variable resistance R is connected to the terminals of the battery. A current `i` is drawn from the battery. V is the terminal potential difference. If R alone is gradually reduced to zero, which of the following best describes `i and

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

0 votes

0 answers

Resistance and Resistivity The materials can be classified as conductors, semiconductors and insulators depending on their resistivities, in an increasing order of their values. Metals have low resistivities in the range of `10^(-8)Omegam` to `10^(-6)Omegam`. At the other end are insulators like ceramic, rubber and plastics having resistivities `10^(18)` times greater than metals or more. In between these two are the semiconductors. These however, have resistivities characteristically decreasing with a rise in temperature. The resistivities of semiconductors can be decreased by adding small amount of suitable impurities. This last feature is exploited in use of semiconductors for electronic devices.Commercially produced

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

0 votes

0 answers

A charge particle after being accelerated through a potential difference `V` enters in a uniform magnetic field and moves in a circle of radius `r`. If `V` is doubled, the radius of the circle will

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

0 votes

0 answers

Assertion: If a charged particle is projected in a region, where B is perpendicular to velocity of projection, then the net force acting on the particle is independent of its mass. Reason: The particle is performing uniform circular motion and force acting on it is

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

Hot questions

Categories