Moving charges and megnatism

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22 Terms

1
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What is a moving charge?

A moving charge refers to a charge (positive or negative) that is in motion, generating an electric current.

2
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How do moving charges create magnetic fields?

Moving charges create magnetic fields due to the movement of electrons, which generates a magnetic force according to the right-hand rule.

3
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Define magnetic field.

A magnetic field is a vector field around a magnet that exerts a magnetic force on charged particles and is represented by magnetic field lines.

4
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What is the right-hand rule?

The right-hand rule is a mnemonic used to determine the direction of magnetic force, current, or field lines and involves positioning your thumb and fingers in specific orientations.

5
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What is the relationship between electric current and magnetic field?

An electric current flowing through a conductor generates a magnetic field around it, with the field direction determined by the right-hand rule.

6
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What happens when a charged particle moves through a magnetic field?

A charged particle moving through a magnetic field experiences a magnetic force, which alters its path, typically resulting in circular or helical motion.

7
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What is electromagnetism?

Electromagnetism is the branch of physics that studies the interactions between electric charges and magnetic fields.

8
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What is Faraday's Law of electromagnetic induction?

Faraday's Law states that a changing magnetic field within a closed loop induces an electromotive force (emf) in the wire.

9
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What is magnetic flux?

Magnetic flux is the measure of the amount of magnetic field passing through a given area, calculated as the product of the magnetic field strength and the area.

10
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How do solenoids generate a magnetic field?

A solenoid generates a magnetic field when an electric current passes through its coil, creating a uniform magnetic field inside the solenoid.

11
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What is the formula for the magnetic force on a moving charge?

The magnetic force (F) on a moving charge (q) is given by F = q(v Ă— B), where v is the velocity vector and B is the magnetic field vector.

12
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What is the formula for magnetic field around a straight current-carrying conductor?

The magnetic field (B) around a long straight conductor carrying current (I) is given by B = (ÎĽâ‚€ I) / (2Ď€r), where ÎĽâ‚€ is the permeability of free space and r is the distance from the conductor.

13
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What is the formula for the magnetic field inside a solenoid?

The magnetic field (B) inside a solenoid is given by B = ÎĽâ‚€(nI), where n is the number of turns per unit length and I is the current.

14
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What is the formula for electromagnetic induction?

The induced electromotive force (emf) can be calculated using Faraday's Law: emf = -dΦ/dt, where Φ is the magnetic flux and t is time.

15
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What is the formula for the magnetic flux?

Magnetic flux (Φ) is calculated as Φ = B·A·cos(θ), where B is the magnetic field strength, A is the area, and θ is the angle between the magnetic field and the normal to the surface.

16
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What is the formula for the Lorentz force?

The Lorentz force (F) acting on a charged particle in an electric field (E) and magnetic field (B) is given by F = q(E + v Ă— B).

17
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Magnetic field due to a circular loop of current formula?

The magnetic field (B) at the center of a circular loop carrying current I is given by B = (ÎĽâ‚€ I) / (2R), where R is the radius of the loop.

18
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What is the formula for a magnetic field of a toroid?

The magnetic field (B) inside a toroid is given by B = (ÎĽâ‚€NI) / (2Ď€r), where N is the number of turns, I is the current, and r is the distance from the center of the toroid.

19
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What is the formula for the motional emf?

The motional emf (ε) induced in a conductor of length L moving with velocity v in a magnetic field B is given by ε = B(Lv sin(θ)), where θ is the angle between the direction of motion and the magnetic field.

20
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What is the formula for induced current?

The induced current (I) in a circuit can be calculated using Ohm's Law: I = emf/R, where R is the total resistance in the circuit.

21
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What is the formula for the magnetic force on a moving charge?

The magnetic force (F) on a moving charge (q) is given by F = q(v Ă— B), where v is the velocity vector and B is the magnetic field vector.

22
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