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Magnetics > Magnetism > Flashcards

Magnetism Flashcards

1
Q

magnetic field general formula for any element

A
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2
Q

work done by magnetic field on a charge movine in cricular area due to the field force is?

A

0 as it is perpendicular to the motion of the charge

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3
Q

field due to a finite wire

A
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4
Q

field if the point if out side the wire range

A
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5
Q

field if the wire is infinite

A
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6
Q

field if the wire is semi infinite

A
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7
Q

magnetic field of an arc

A
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8
Q

magnetic field of at the centre of a circular loop

A
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9
Q

magnetic field at the axis from a circular loop

A
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10
Q

magnetic field at the axis from a circular loop graph

A
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11
Q

force on moving charge

A
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12
Q

lorentz force on a charge

A
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13
Q

radius of the path formed by a charge in a field area where B is perpendicular to the motion

A
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14
Q

time period of motion of charge in a field area where B is perpendicular to the motion

A
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15
Q

type of motion if the magnetic field is making some angle with the ccharge

A

helical motion

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16
Q

which velocity part contributes to the circular path and which contributes to the straight line part

A

V Cosθ contributes to straight line

V Sinθ contributes to the circular motion

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17
Q

what will be the radius of the helical motion

A
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18
Q

what will be the pitch of the helical motion

A

the speed in the horizontal direction multiple by the time period of a circular motion will be the pitch

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19
Q

what if the magnetic and electric fields are in the same direction and the charge is in the same direction as the fields

A

The magnetic field won’t act! only the electric field would act

20
Q

what if the magnetic and electric fields are in the same direction and the charge is perpendicular to the fields

A

the charge will move in a helical path

with electric force acting in horizontal direction and magnetic field resulting in circular motion

21
Q

what if the magnetic and electric fields are perpendicular to each other and the charge is perpendicular to them

A
22
Q

whats ampere circuit law

A
23
Q

magnetic field due to solid cylindrical wire outside the wire

A
24
Q

magnetic field due to solid cylindrical wire inside the wire

A
25
Q

magnetic field due to solid cylindrical wire graph

A
26
Q

magnetic field due to hollow cylindrical wire outside wire

A
27
Q

magnetic field due to hollow cylindrical wire inside wire

A
28
Q

magnetic field due to hollow cylindrical wire graph

A
29
Q

for ideal solenoid! the magnetic field inside the solenoid and the magnetic field at the ends =

A
30
Q

graph for a magnetic field of an ideal solenoid

A
31
Q

force on a current-carrying wire

A
32
Q

two wires s kept parallel to each other! if carrying the same current will repel or attract?!

and what if they carry opposite current

A

attract if same direction current

repel in different current direction

33
Q

force per lentgh on the wires kept parallel to each other with current flowing in them

A
34
Q

magnetic moment formula

A
35
Q

magnetic moment formula

A
36
Q

current moving clockwise in a loop represents north or south pole and what if the current is moving anticlockwise

A

clockwise represent the south pole

and anti-clockwise represents the north pole

37
Q

magnetic field direction in a bar magnet

A
38
Q

torque on wire in a magnetic field and having some magnetic moment

A
39
Q

potential energy of a magnetic diploe in a magnetic field

A
40
Q

shunt formula to convert galvanometer in ammeter

A
41
Q

the low value of shunt resistance is used in galvanometer to convert it into voltmeter or ammeter

A

ammeter uses low resistant of shunt

voltmeter requires high value of resistance of shunt

42
Q

current in a galvanometer with angle deflected with the torque constant and magnetic field

A
43
Q

galvanometer constant

A
44
Q

current sensitivity formula

A
45
Q

what can be done to increase the magnetic field magnitude to increase the galvanometer sensitivity

A

concave pole magnet or soft iron core can be used

46
Q

voltage sensitivity formula

A

Magnetics (3 decks)

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