Numerical Assignments | Chapter 12 | Electromagnetism | Physics 11th | National Book Foundation 2025

For latest videos, click on the following link: https://whatsapp.com/channel/0029VaGr... The figure below shows a light Aluminum rod resting between the pole of a magnet. A current is passed through the rod from two brass strips connected to a power supply. (a) On the figure, draw the direction of the current when the switch is closed as shown in fig. (b) State the effect on the movement of the rod when (i) the current is increased, (ii) the current is reversed. Prove that magnetic force is not responsible to do work on a charged particle moving in circular path in magnetic field. In a uniform magnetic field with a strength of 𝟏.𝟐𝟎×〖𝟏𝟎〗^(−𝟑) 𝑻, calculate the radius of an orbit of circular path of an electron moving at a speed of 𝟐.𝟎×〖𝟏𝟎〗^𝟕 𝒎/𝒔. A 15.0cm long solenoid has 300 turns of wire and 5.0A current flow through it. How strong a magnetic field is there inside the solenoid? A magnetic field of 0.8T passes perpendicular to a disc with a radius of 2cm. Find the magnetic flux of the disc. A solenoid contains 200 turns of wire. Each piece of wire has a cross sectional area of 𝟎.𝟎𝟎𝟒𝒎^𝟐 if the magnetic flux density is 𝟏𝟐.𝟎𝒎𝑻 calculate the magnetic flux linkage. A loop of wire is placed in a uninform magnetic field that is perpendicular to the plane of the loop. The strength of the magnetic field is 0.6T. The area of the loop begins to shrink at a constant rate of 𝟎.𝟖𝒎^𝟐/𝒔. What is the magnitude of emf induced in the loop while it is shrinking? A horizontal power line carries a current of 600A from south to north. Earth’s magnetic field 5×〖10〗^(-5) T is directed toward the north and inclined downward at 70° to the horizontal. Find the magnitude and direction of the magnetic force on 100m of the line due to Earth’s magnetic field. A proton is accelerated in a cyclotron in which the magnetic induction is 0.75Wb/m^2. Find the cyclotron frequency. A velocity selector consists of electric and magnetic fields described by the expression E ⃗=Ek ̂ and B ⃗=Bj ̂. With B=18.0mT. Find the value of E such that electron of energy 850eV moving in the negative x direction is undeflected. Two long straight parallel wires are 0.6m apart and carry current 4A and 8A. Find the point lying between two wires at perpendicular distance where resultant magnetic field will be zero (neutral point). A coil of wire has 100 loops. Each loop has an area of 2.0×〖10〗^(-3) m^2. A magnetic field is perpendicular to the surface of each loop at all times. If the magnetic field is changed from 0.2T to 0.6T in 0.1s, find the average emf induced in the coil during this time. A 2m long wire carrying a current of 15A is placed in a uniform magnetic field of 0.50T. If the wire makes an angle of 60° with the direction of magnetic field, find the magnitude of the magnetic force acting on the wire. Data: L=2m A particle carrying a charge of 1μC and moving with velocity of 2×〖10〗^6 m/s enter in a magnetic field of 0.5T at angle of 60° with the field. Calculate the magnitude of magnetic force acting on it. A single circular loop has radius 2cm. The plane of the loop lies at 40° to a uniform magnetic field of 0.2T. Find the magnitude of the magnetic flux through the loop. Find the magnetic force acting on a charged particle of charge 2μC in a magnetic field of 2T acting in y-direction when particle velocity is (2i ̂+3j ̂)×〖10〗^6 ms^(-1).