One conducting U tube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field B is perpendicular to the plane of the figure. If each tube moves towards the other at a constant speed v, then the emf induced in the circuit in terms of B, l and v where l is the width of each tube, will be

Anonymous User Physics Magnetostatics 19 Apr, 2020 1 Answer 61 views

A metal conductor of length 1 m rotates vertically about one of its ends at angular velocity 5 radian per second. If the horizontal component of earth’s magnetic field is 0.2 × 10-4 T, then the e.m.f. developed between the two ends of the conductor

Anonymous User Physics Magnetostatics 19 Apr, 2020 1 Answer 58 views


In a uniform magnetic field of induction B a wire in the form of a semicircle of radius r rotates about the diameter of the circle with angular frequency . The axis of rotation is perpendicular to the field. If the total resistance of the circuit is R the mean power generated per period of rotation is

Anonymous User Physics Magnetostatics 19 Apr, 2020 1 Answer 61 views

A coil having n turns and resistance R  is connected with a galvanometer of resistance 4R . This combination is moved in time t seconds from a magnetic field W1 weber to W2 weber. The induced current in the circuit is

Anonymous User Physics Magnetostatics 19 Apr, 2020 1 Answer 58 views











The length of a magnet is large compared to its width and breadth. The time period of its oscillation in a vibration magnetometer is 2 s. The magnet is cut along its length into three equal parts and three parts are then placed on each other with their like poles together. What will be the time period of this combination? 

Anonymous User Physics Magnetostatics 18 Apr, 2020 1 Answer 54 views

There are several types of enzyme catalysed reactions. In
one type of enzyme catalysed reaction, in addition to the
catalytic site to which the substrate (X) binds, the enzyme
also has a site to which some other substance (Y) can bind.
When Y binds to such an enzyme, the enzyme can still bind
to the substrate but cannot convert it to the product. Which
of the following will occur in such a case?

Anonymous User Biology 18 Apr, 2020 1 Answer 65 views



During the growth of marine fish, initially, yolk sac and skin are the principal sites where transport protein ‘x’ is located. Later, skin and gills become principal sites and finally ‘x’ becomes localised to gills. The protein ‘x’ is

Anonymous User Biology 18 Apr, 2020 1 Answer 64 views


Two identical conducting wires AOB and COD are placed at right angles to each other. The wire AOB carries an electric current I1 and COD carries a current I2. The magnetic field on a point lying at a distance d from O, in a direction perpendicular to the plane of the wires AOB and COD, will be given by

Anonymous User Physics Magnetic Effect of Current 17 Apr, 2020 1 Answer 63 views


A charged particle with charge q enters a region of constant, uniform and mutually orthogonal fields and  with a velocity  perpendicular to both and , and comes out without any change in magnitude or direction of . Then

Anonymous User Physics Magnetic Effect of Current 17 Apr, 2020 1 Answer 56 views








A long solenoid has 200 turns per cm and carries a current i. The magnetic field at its centre is 6.28 × 10-2 Wb/m2. Another long solenoid has 100 turns per cm and it carries a current i/3. What will be the value of the magnetic field at its centre? 

Anonymous User Physics Magnetic Effect of Current 16 Apr, 2020 1 Answer 119 views

In a region, steady and uniform electric and magnetic fields are present. These two fields are parallel to each other. A charged particle is released from rest in this region. What will be the path of the particle?

Anonymous User Physics Magnetic Effect of Current 16 Apr, 2020 1 Answer 60 views



Two concentric coils each of radius equal to  cm are placed at right angles to each other. 3 ampere and 4 ampere are the currents flowing in each coil respectively. The magnetic induction in weber/m2 at the center of the coils will be 

Anonymous User Physics Magnetic Effect of Current 16 Apr, 2020 1 Answer 54 views

A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10 divisions per milliampere and voltage sensitivity is 2 divisions per millivolt. In order that each division reads 1 volt, the resistance in ohms needed to be connected in series with the coil will be

Anonymous User Physics Magnetic Effect of Current 16 Apr, 2020 1 Answer 55 views


Two long conductors, separated by a distance d carry current I1 and I2 in the same direction. They exert a force F on each other. Now the current in one of them is increased to two times and its direction is reversed. The distance is also increased to 3d. What will be the new value of the force between them?

Anonymous User Physics Magnetic Effect of Current 16 Apr, 2020 1 Answer 62 views


A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is B. It is then bent into a circular loop of n turns. What will be the magnetic field at the centre of the coil? 

Anonymous User Physics Magnetic Effect of Current 16 Apr, 2020 1 Answer 64 views



A particle of charge –16×10-18 coulomb moving with velocity 10 ms-1 along the x-­axis enters a region where a magnetic field of induction B is along the y-­axis, and an electric field of magnitude 104 V/m is along the negative z-­axis. If the charged particle continues moving along the x­axis, then what will be the magnitude of B?

Anonymous User Physics Magnetic Effect of Current 16 Apr, 2020 1 Answer 58 views

A particle of mass M and charge Q moving with velocitydescribes a circular path of radius when subjected to a uniform transverse magnetic field of induction B. What will be the work done by the field when the particle completes one full circle? 

Anonymous User Physics Magnetic Effect of Current 16 Apr, 2020 1 Answer 54 views