Q13 of 26 Page 1

(a) Write the expression for the magnetic force acting on a charged particle moving with velocity n in the presence of magnetic field B.

(b) A neutron, an electron and an alpha particle moving with equal velocities, enter a uniform magnetic field going into the plane of the paper as shown. Trace their paths in the field and justify your answer.



a)


The force which is applied on the particle of charge(q) with “n” velocity when entered in a magnetic field of B, is portrayed as



b)


When an neutron, electron, and an alpha particle enter in a magnetic field which is point inside the page or away from the user, the path of the particles are traced by equating the force of particle movement with force acted on the particle by the magnetic field(force on the particle is taken out by Fleming’s right hand rule).



where


is the charge of the particle, is the velocity, is the magnetic field, is the mass of the particle, is the radius of the motion of the particle.


1. For Neutron: The particle travels in straight line as there is no charge in a neutron thereby no variation is found in its movement.


2. For Electron: The electron due both charge and mass will move in a circle path due to magnetic field effect.


3. For Alpha particle: Like electron will move in a circular path but will have a larger radius due to high mass and charge strength.


More from this chapter

All 26 →
11

A charge is distributed uniformly over a ring of radius ‘a’. Obtain an expression for the electric intensity E at a point on the axis of the ring. Hence show that for points at large distances from the ring, it behaves like a point charge.

 12

Write three characteristic features in photoelectric effect which cannot be explained on the basis of wave theory of light, but can be explained only using Einstein’s equation.

 14

(i) Define mutual inductance.

(ii) A pair of adjacent coils has a mutual inductance of 1.5 H. If the current in one coil changes from 0 to 20 A in 0.5 s, what is the change of flux linkage with the other coil?


 15

Two parallel plate capacitors X and Y have the same area of plates and same separation between them. X has air between the plates while Y contains a dielectric medium of ϵr = 4.


(i) Calculate capacitance of each capacitor if equivalent capacitance of the combination is 4 μF.


(ii) Calculate the potential difference between the plates of X and Y.


(iii) Estimate the ratio of electrostatic energy stored in X and Y.