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Magnetic Moment and Pole Strength (in Hindi)
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Analogy between electrostatics and magnetism

Udit Gupta
A Mechanical Engineer from NIT Allahabad here to help learners with physics. Also a Star ⭐ educator.

U
Unacademy user
Thank you for the course, much needed at this time
R
fully hc Verma
Sir, what is the need of this hypothetical model?
Udit Gupta
a year ago
just to make sense and understand easily is the point..
Snigdh Bhardwaj
a year ago
Thanks to reply, Is it a pure hypothetical model, just to resemble magnetism with electrostatics, or there is little bit of back?
Snigdh Bhardwaj
a year ago
Thanks to reply, Is it a pure hypothetical model, just to resemble magnetism with electrostatics, or there is little bit of back?
Snigdh Bhardwaj
a year ago
Thanks to reply, Is it a pure hypothetical model, just to resemble magnetism with electrostatics, or there is little bit of back?
Snigdh Bhardwaj
a year ago
Thanks to reply, Is it a pure hypothetical model, just to resemble magnetism with electrostatics, or there is little bit of back?
Snigdh Bhardwaj
a year ago
Thanks to reply, Is it a pure hypothetical model, just to resemble magnetism with electrostatics, or there is little bit of back?
An electron moves with velocity v in uniforn transverse magnetic field B on circular path of radius r, then e/m for it is?
Udit Gupta
a year ago
what does e and m denote here? if they are the elctronic charge and mass of electron, then just put the values here. Else specify what are these parameters.
Eesha Gupta
a year ago
Sir, it is only written e/min the question
Eesha Gupta
a year ago
e/m in the question*
Udit Gupta
a year ago
put e=1.6×10^-19 and m=9.1×10^-31
Is it the complete course that is useful for IIT JEE or courses are to be added yet?
Udit Gupta
a year ago
for mains it is sufficient. just attempt the previous year questions and it is complete
oh ok sir thank you so much
m refers to magnetic moment?? B =u०m/4πr^2 is the magnetic field at any point or at only equitorial point. axial ponit ka 2u०m/4πr^2 hoga na. just like electric field at axial of dipole???
Udit Gupta
a year ago
m is pole strengh, not magnetic moment. basically relate to point charge of electrostatics and you will understand automatically. i have also specifically told the fact that m here refers to pole strength.
  1. MAGNETISM MATTER Magnetic Poles and Bar Magnets


  2. Greetings! I am your educator- Udit Gupta Today, I will guide you regarding the first topic in this chapter which is magnetic poles and bar magnets. https://unacademy.com/user/udit13


  3. Introduction We have seen in the previous courses that a small current loop carrying a current i, produces a magnetic field: Ho 2,0 at an axial point. Here -iA is the magnetic dipole moment of the current loop. The vector A represents the area vector of the current loop current loop placed in a magnetic field B experiences a torque, Also, a


  4. Introduction We also know that an electric dipole produces an electric field 1 2p 4TEo d at axial point and it experiences a torque when placed in an electric field. The two equations for fields and torque are similar in structure. This similarity suggests that the behavior of a current loop can be described by the following hypofhefical model.


  5. Hypothetical Model a) There are two types of magnetic charges, a positive magnetic charge and a negative magnetic charge. A magnetic charge m placed in a magnetic field B experiences a force F = mB The force on a positive magnetic charge is along the field and the force on a negative charge is opposite to the field.


  6. Hypothetical Model b) A magnetic charge m produces a magnetic field at a distance r from it. The field is radially outward if the magnetic charge is positive and is inward if it is negative. c) A magnetic dipole is formed when a negative magnetic charge - m and a positive magnetic charge +m are placed at a small separation d. The magnetic dipole moment is = md and its direction is from-m to +m. The line joining-m and +m is called the axis of the dipole.


  7. Hypothetical Model d) A current loop of area A carrying a current i maybe replaced by a magnetic dipole of dipole moment = md = iA placed along the axis of the loop. The area-vector A points in the direction - m to +m -m +m


  8. Conclusion The model is very useful in studying the magnetic effects and is widely used. It is customary to call a positive charge-North Pole and ar negative magnetic charge - South Pole. They are represented by N and S respectively. From the equation md-IA or F#m8, we can easily see that the unit of pole strength is A-m We can find the magnetic field due to a magnetic dipole at any point P using the equation, for both poles: . Hom


  9. THANKS FOR WATCHING! If you think this was genuine stuff and could benefit other do not forget to rate & review this course. Doubts and queries are welcome. Comment or leave a message to get it sorted. For more such courses, visit: https://unacademy.com/user/udit13


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