Advertisements
Advertisements
प्रश्न
A proton has spin and magnetic moment just like an electron. Why then its effect is neglected in magnetism of materials?
Advertisements
उत्तर
Spinning of a proton is negligible as compared to that of electron spin because its mass is very larger than the mass of an electron.
The comparison between the spinning of a proton and an electron can be done by comparing their magnetic dipole moment which can be given by
As we know that magnetic moment of a charged particle of charge e and mass m is Me = `(eh)/(4πme)` and Mp = `(eh)/(4πm p)`
As charge on proton and electron are equal in magnitude so
`M oo 1/m` or `M_e/M_p = m_p/m_e`
As the mass of proton is 1836 times as of electron, so magnetic moment of proton
`M_p = M_e/m_p m_e = (M_e * m_e)/(1836 m_e)`, `M_p = 1/1836` of `M_e`
So magnetic moment of proton is `1/1836` times of electron, so can be neglected.
APPEARS IN
संबंधित प्रश्न
Magnetic lines of force are closed continuous curves.
Write any three properties of magnetic lines of force.
How are the magnetic field lines different from the electrostatic field lines?
An iron needle is attracted to the ends of a bar magnet but not to the middle region of the magnet. Is the material making up the ends of a bare magnet different from that of the middle region?
Answer the following question in brief.
What happens if a bar magnet is cut into two pieces transverse to its length/along its length?
Solve the following problem.
A magnetic pole of a bar magnet with a pole strength of 100 A m is 20 cm away from the centre of a bar magnet. The bar magnet has a pole strength of 200 A m and has a length of 5 cm. If the magnetic pole is on the axis of the bar magnet, find the force on the magnetic pole.
A closely wound solenoid of 2000 turns and area of cross-section 1.6 × 10-4 m2 , carrying a current of 4.0 A, is suspended through its centre allowing it to turn in a horizontal plane.
What is the force and torque on the solenoid if a uniform horizontal magnetic field of 7.5 × 10-2 T is set up at an angle of 30° with the axis of the solenoid?
When iron filings are sprinkled on a sheet of glass placed over a short bar magnet then, the iron filings form a pattern suggesting that the magnet has ______.
Magnetic field at far axial point due to solenoid as well as bar magnet varies ______.
According to the dipole analogy 1/ε0 corresponds to ______.
The resistance of ideal voltmeter is
The magnetic moment of atomic neon is equal to
At a certain 100 p of reduces 0.0/57 m carrier a current of 2 amp. The magnetic field at the centre of the coop is [`mu_0 = 4pi xx 10^-7` wb/amp – m]
A magnetic needle suspended freely orients itself:-
A particle having charge 100 times that of an electron is revolving in a circular path by radius 0.8 with one rotation per second. The magnetic field produced at the centre is
Magnetic dipole moment is a ______
Verify the Ampere’s law for magnetic field of a point dipole of dipole moment m = m`hatk`. Take C as the closed curve running clockwise along (i) the z-axis from z = a > 0 to z = R; (ii) along the quarter circle of radius R and centre at the origin, in the first quadrant of x-z plane; (iii) along the x-axis from x = R to x = a, and (iv) along the quarter circle of radius a and centre at the origin in the first quadrant of x-z plane.
