Electromagnetism II Flashcards

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1
Q

Because this fucking retarded trash does not allow me to edit something that had been edited in advanced editor.

A

I paid $50 for this shit that doesn’t have advanced editor on mobile. Fuck this crap.

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2
Q

How does a velocity selector work?

A

Particles with a specific speed continue to travel in a straight path while particles with other speeds are deflected. The velocity selector is arranged such that electric field produces a force in the opposite direction on a charged particle compared to the magnetic field. (Perpendicular to each other)

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3
Q

Derive the speed at which a charged particle is not deflected in a velocity selector.

A

This occurs when there is no net force, aka electric force = magnetic force. qE = Bqv. v = E/B.

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4
Q

Explain the direction charged particles are deflected in a velocity selector based on their speed.

A

The electric force is always the same since qE is constant. If the speed is slower than v = E/B, magnetic force, Bqv is lower so there is net force by the electric field so the particle will be deflected in the direction of the electric field. Vice versa.

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5
Q

Why is the deflection of particles in a velocity selector independent of charge?

A

Charge affects both electric force and magnetic force proportionally.

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6
Q

What is the magnetic flux density in a Long straight wire?

A

B mu0 I/(2pi d) where d is the distance from the wire and mu0 is the permeability of free space

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7
Q

What is the flux Density at the centre of a flat coil with n turns and radius r?

A

B = mu0 NI/(2r)

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8
Q

What is the flux density at the centre of a Long solenoid?

A

B = mu0 n I

n is the number of turns per metre.

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9
Q

With a ferrous core the flux density is multiplied by _____.

A

The factor of the permeability of the ferrous core to mu0. (At the same temperature)

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10
Q

How is the direction of the force on a current-carrying straight wire by another parallel current-carrying straight wire determined?

A

Magnetic field lines of wire is circular and perpendicular to any parallel wires. Thus, the force is perpendicular to both the direction of current and the magnetic field.

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11
Q

Derive the force exerted on a current-carrying wire by another current-carrying wire that is parallel.

A
F = BIL
B = mu0 I/(2pi d)
F = mu0 I1I2 l/ (2pi d)

The other wire exerts the same but opposite force because of N3L.

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12
Q

Why are magnetic field lines in the same direction stronger?

A

S

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13
Q

Why are magnetic field lines in opposite directions weak?

A

They magnetic field of each line cancel each other out.

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14
Q

As the charged particle moves towards the velocity, what energy is lost what energy is gained?

A

As the particle is increasing in speed, it gains kinetic energy the energy comes from its electric potential. 0.5mv2 = QV

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