Magnetic Field Flashcards

1
Q

What is magnetic field

A

Field of force created by moving current or permanent magnets

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2
Q

When does a current carrying wire experience a force

A

When the current passing through it is perpendicular to the magnetic field lines

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3
Q

What is the strength of a magnetic field known as

A

Magnetic flux density

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4
Q

Equation of force on current carrying wire

A

F=BILsinx

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5
Q

What does the thumb, index and middle finger represent in the lemmings left hand rule

A

Thumb) force
Index) magnetic field
Middle) current

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6
Q

Magnetic flux density

A

Force acting per unit current per unit length on a current carrying conductor placed perpendicular to the magnetic field

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7
Q

Define Tesla

A

A straight conductor carrying a current of 1A normal to a magnetic field of flux density of 1T with force per unit length of the conductor of 1 N/m

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8
Q

Equation of force on moving charge

A

F=BQVsinx

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9
Q

Define hall voltage

A

The pd is produced across an electrical conductor when an external magnetic field is applied perpendicular to the current through the conductor

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10
Q

Deriving Hall voltage

A

E=Vh/d
F=BQv
Fe=qE
Bqv=qE
E=Bv
Vh/d=Bv
Vh/d = B(I/Anq)
Vh=BI/ntq

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11
Q

How to measure magnetic flux density

A

Using hall voltage magnetic field perpendicular to metal

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12
Q

Circular motion and mag fiel

A

mv^2/r=Bqv
r=mv/bq

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13
Q

Velocity selection

A

A device consisting of perpendicular magnetic and electric fields where charged particles with a specific velocity can be filtered

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14
Q

Velocity selection equation

A

Bqv=eq
V=e/B

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15
Q

Magnetic field lines in a current carrying wire

A

Use right hand screen Rule
Thumb represents current

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16
Q

Factors that affect magnetic field strength

A

Adding a core of iron rich material
Adding more turns

17
Q

If currents in opposite direction will the mag field attract

18
Q

Define magnetic flux

A

The product of the magnetic flux density and the cross-sectional area perpendicular to the magnetic flux density

19
Q

Equation of mag flux

A

=BA
=BAcosx

20
Q

Magnetic flux linkage

A

Product of magnetic flux and the number of turns

21
Q

Unit of magnetic flux

22
Q

Unit of magnetic flux linkage

23
Q

Equation of magnetic flux linkage

24
Q

Define electromagnetic induction

A

A process in which emfs is induced in a closed circuit due to change in magnetic flux

25
Faraday's law
The magnitude of the induced emf is directly proportional to the rate of change in magnetic flux linkage
26
Equation of farday's law
=N^BA/^t
27
Lenz's law
The induced emf acts in such a direction to produce effects which oppose the change causing it
28
Equation of lenzs law
Same as Faraday but opp