magnetic effects of current

Question 1

formula for biot sarvatlaw

Answer 1

dB = u⁰i dl sin theta /4π r²
dB change in magnetic field
i current
dl change in length ofcurrentelement

Question 2

Vector form of biot sarvatlaw

Answer 2

dB = u⁰i dl sin theta n^ /4π r²
dB change in magnetic field
i current
dl change in length of current element
n^ unit vector perpendicular to planeofidl→andr→

Question 3

formula for magnetic field due to a straightwire

Answer 3

u⁰i[ sin∅1 + sin∅2]/4πa

Question 4

magnetic field due to infinite length wireatpointP

Answer 4

Bp = u⁰I/2πd

Question 5

magnetic field due to semi infinite length wireatpointP

Answer 5

Bp = u⁰i.[sin theta + 1]/4πd

Question 6

Magnetic field due to special semi infinite length wireatpointP

Answer 6

Bp = u⁰i/4πd

Question 7

magnetic field due to special finite length wireatpointP

Answer 7

Bp = u⁰i. Sin theta/4πd

Question 8

If point P lies out side the line of wire then magnetic fieldatpointP

Answer 8

u⁰i(cos alpha1 - cos alpha2)/4πd

Question 9

magnetic field at centre

Answer 9

B centre= u⁰i/2R

Question 10

magnetic field at point very close tocentre

Answer 10

B = u⁰i2πR²/4πx²

Question 11

magnetomotive force formula

Answer 11

MMF= ∅Hbar . dl bar=£i

Question 12

magnetic field due to infinite long thin current carrying straightconductor

Answer 12

B = u⁰i/2πr

Question 13

magnetic field due to infinite long solid cylindricalconductor