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 128 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 62 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 55 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 57 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 63 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 67 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 64 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 55 views












From 6 different novels and 3 different dictionaries, 4 novels and 1 dictionary are to be selected and arranged in a row on a shelf so that the dictionary is always in the middle. Then the number of such arrangements is

Anonymous User Maths Permutation & Combination 15 Apr, 2020 1 Answer 68 views







Two voltameters, one of copper and another of silver, are joined in parallel. When a total charge q flows through the voltmeters, equal amount of metals are deposited. If the electrochemical equivalents of copper and silver are z1 and z2 respectively the charge which flows through the silver voltameter is

Anonymous User Physics Thermal and Chemical Effects of Current 15 Apr, 2020 1 Answer 71 views









The negative Zn pole of a Daniell cell, sending a constant current through a circuit, decreases in mass by 0.13 g in 30 minutes. If the electrochemical equivalent of Zn and Cu are 32.5 and 31.5 respectively, the increase in the mass of the positive Cu pole in this time is

Anonymous User Physics Thermal and Chemical Effects of Current 14 Apr, 2020 1 Answer 60 views

The thermo e.m.f. of a thermo­couple is at room temperature. A galvanometer of 40 ohm resistance, capable of detecting current as low as 10-5 A, is connected with the thermocouple. The smallest temperature difference that can be detected by this system is

Anonymous User Physics Thermal and Chemical Effects of Current 14 Apr, 2020 1 Answer 59 views