Class 12 Physics: Moving Charges and Magnetism
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Questions and Answers

What is the relationship between moving charges and magnetism in Class 12 Physics?

Moving charges produce magnetic fields.

What is the region around a magnet or electrical current where magnetic forces can be detected?

A magnetic field

What is the formula for the magnetic field dB in the Biot-Savart law?

dB = ( * I * dl r) / (4 * r)

What is the direction of the force experienced by a moving charge in a magnetic field?

<p>Perpendicular to both the velocity and the magnetic field</p> Signup and view all the answers

What is the formula for the force experienced by a current-carrying wire of length L in a magnetic field B?

<p>F = IL B</p> Signup and view all the answers

What is the direction of the torque experienced by a current loop of area A in a magnetic field B?

<p>Perpendicular to the plane of the loop</p> Signup and view all the answers

What is the formula for the electromotive force (EMF) induced in a loop of wire due to a changing magnetic flux?

<p>= -N(d/dt)</p> Signup and view all the answers

What is the direction of the induced current in a loop of wire due to a changing magnetic flux?

<p>Opposite to the change in magnetic flux</p> Signup and view all the answers

What is the unit of permeability of free space ?

<p>Tm/A</p> Signup and view all the answers

What is the magnetic moment of a current loop?

<p>= IA</p> Signup and view all the answers

What is the purpose of the cross product in the formulas for force and torque in magnetism?

<p>To find the direction of the force or torque</p> Signup and view all the answers

Study Notes

Magnetic Field

  • Magnetic fields are regions around magnets or electrical currents where magnetic forces can be detected.
  • Moving charges or changing electric fields create magnetic fields.
  • Magnetic field lines emerge from the north pole and enter the south pole of a magnet.

Biot-Savart Law

  • The Biot-Savart law relates the magnetic field dB to the current I, length of wire element dl, and distance r from the wire element.
  • dB = (μ₀ * I * dl × r) / (4π * r³)
  • μ₀ is the permeability of free space (4π × 10^-7 T·m/A).

Force on a Moving Charge

  • A moving charge q experiences a force F in a magnetic field B.
  • F = qv × B
  • v is the velocity of the charge.
  • The direction of the force is perpendicular to both the velocity and the magnetic field.

Force on a Current-Carrying Wire

  • A current-carrying wire of length L in a magnetic field B experiences a force F.
  • F = IL × B
  • I is the current in the wire.
  • L is the length of the wire.
  • The direction of the force is perpendicular to both the wire and the magnetic field.

Torque on a Current Loop

  • A current loop of area A in a magnetic field B experiences a torque τ.
  • τ = μ × B
  • μ is the magnetic moment (IA).
  • The direction of the torque is perpendicular to the plane of the loop.

Electromagnetic Induction

  • A changing magnetic flux through a loop of wire induces an electromotive force (EMF).
  • ε = -N(dΦ/dt)
  • ε is the induced EMF.
  • N is the number of turns in the coil.
  • Φ is the magnetic flux through the coil.
  • The direction of the induced current opposes the change in magnetic flux.

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Test your understanding of the relationship between moving charges and magnetism, an important concept in Class 12 Physics. Covers topics like electromagnetic induction, magnetic fields, and more.

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