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12th Physics | Chapter 10 | Magnetic Field Due to Electric Current | Lecture 1 | Magnetic Field |

JR College・24 minutes read

Sanjeev Pandey discusses the relationship between magnetic fields and electric currents, emphasizing the importance of understanding current electricity for board exams and MSC set. The lecture covers magnetic force, magnetic field, the left-hand rule, Lawrence's force, and the formula for magnetic force on a wire, highlighting the interconnectedness of electric and magnetic fields.

Insights

  • The relationship between magnetic fields and electric currents is crucial, showcasing how electric current generates a magnetic field through interconnected forces, impacting the direction of the force through the left-hand rule.
  • Magnetic force, determined by the cross product of velocity and magnetic field, plays a significant role in Lawrence's force, combining with electric forces to influence the net force on a charge, with factors like angle and perpendicularity affecting its magnitude, emphasizing the importance of detailed understanding for board exams and MSC set preparation.

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Recent questions

  • What is the relationship between magnetic fields and electric currents?

    They are interconnected; current produces a magnetic field.

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Summary

00:00

Understanding Magnetic Fields and Electric Currents

  • Sanjeev Pandey welcomes viewers to Zoo College, part of Zoo Tutorial, discussing current electricity in the previous lecture.
  • The importance of understanding current electricity for board exams and MSC set is highlighted.
  • Chapter nine focuses on the relationship between magnetic fields and electric currents.
  • When electric current flows, a magnetic field is produced, showing the interconnectedness of electric and magnetic fields.
  • The discussion includes magnetic force, magnetic field, and the force on a wire carrying current.
  • Magnetic force is defined as the cross product of velocity and magnetic field, impacting the direction of the force.
  • The direction of the magnetic force is determined using the left-hand rule.
  • Lawrence's force combines magnetic and electric forces acting on a charge, leading to a net force.
  • Conditions affecting the presence of magnetic force include the angle between velocity and magnetic field, with force being zero when they are parallel.
  • The magnitude of magnetic force is influenced by the perpendicularity of velocity and magnetic field, with the formula FM = KVB.

16:35

"Electric and Magnetic Fields: Basics Explained"

  • Electric field is defined as the force acting on a positive charge, with velocity denoted by F/K = Velocity.
  • The magnetic field is closely related to the electric field, with the unit of magnetic field being Tesla.
  • The dimension of magnetic field is l0 m1 t - 2 i - 1.
  • One Tesla is approximately equal to 10^4 Gauss.
  • The formula for magnetic force on a wire with current flowing through it is FM = i l b sin θ.
  • The angle between the length of the wire and the magnetic field determines the magnetic force.
  • For a closed wire in an external magnetic field, the net magnetic force is zero due to opposing forces.
  • Understanding the basics and revising with notes is crucial for grasping the chapter effectively.
  • Encouragement to like, subscribe, and share the video for further learning and support.
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