Magnetic field due to current can affects a compass.If we use alternating current or direct current,explain how magnetic field will differ for both cases.Explain the relationship between distance and magnetic field strenght

Question

anonymous · Answer

anyone can help me??

naveenbabbar · Answer

You will observe deflection in the needle only for dc. For this read biot savart law

anonymous · Answer

huh!deflection for dc current....i don`t understand,can u explain to me?

naveenbabbar · Answer

Because for dc the direction of magnetic field as well as its magnitude remains constant but not for ac. As you have placed a magnetic needle in the magnetic field of the wire, so it will experience a torque and some for as the field of the wire is nonuniform

anonymous · Answer

okay..but what is the relation between distance n magnetic field strength as we use the dc or ac current...still blurr..

naveenbabbar · Answer

in which standard do you read?

naveenbabbar · Answer

If you have read magnetostatics go for biot savart law which tells you about the magnetic field produced due to a current carrying conductor

naveenbabbar · Answer

It tell us that the magnetic field due to curent carring wire is proportional to the current in the conductor, length of the element, sine of angle and inversly proportional to the square of distance

vincent-lyon.fr · Answer

But for a long wire, B decrease as 1/r, not 1/r²