Flashcards in Magnetism. Deck (23):
What is Magnetic force on a moving charge ?
F= q( V x B)= qVBsin #
What are the 3 general paths of a charged particle in uniform charged field ?
If #=0 or 180, path is a straight line.
If #=90 , path is a circle.
For any other #, path is a helix. # is the angle between V and B
In magnetism , What is radius r=?
r= mv/qB=P/Bq= √2Km/Bq=√2qVm/Bq
In magnetism, What is time period T and ω?
In magnetism , What is radius r=?,time period T=? and frequency f=? for a particle in a helical path?
r= mv sin#/qB
What is pitch of a helical path
p= (v cos #)T=2πmv cos#/qB
What is magnetic force due to a current carrying conductor ?
F= i(I x B)= ilBsin #
Here # is the angle between I and B or between direction of current an magnetic field.
What is magnetic dipole moment M=?
Every current carrying loop in a magnetic dipole.
Direction of M is perpendicular to the plane of the loop and given by right hand screw law
What is force on magnetic dipole due to a uniform magnetic field F=?
What is torque on magnetic dipole due to a uniform magnetic field ?
Torque = M x B= MB sin #
What is potential energy U on magnetic dipole due to a uniform magnetic field
U=-M.B= -MB cos #
For magnetic dipole in an uniform magnetic field , what is the condition for unstable equilibrium position of the loop?
#=0 is the unstable equilibrium position of the loop.
U=MB( maximum )
magnetic field due to a straight wire of finite length B=?
B=μ₀/4π i÷r (sin α± sin β)
What is magnetic field B due to a straight wire of uninvited length =?
What is magnetic field B on the axis of a circular loop =?
B= μ₀NiR²÷2(R² + x²)^3/2
What is magnetic field B at the centre of circular loop = ?
What is magnetic field B on the axis of a solenoid = ?
B= μ₀ni/2 (cos #1- cos#2)
What is magnetic field B at centre of a long solenoid = ?
B = μ₀ni
What is magnetic field B at the ends of a long solenoid = ?
Mathematically , what is ampere's circuital law ?
∫B .dI = μ₀i( net)
What is Force per unit length between two parallel current carrying wires ?
F/l= μ₀/2π x i₁i₂/r
There will be attraction if the currents are in the same direction and if currents re in opposite direction there will be repulsion.
What is SI unit of magnetic field ?
Tesla. = 1 Wb/ m^