2017:
The magnetic field at the centre of the loop is given by:
B = μ0I/2r
where μ0 is the permeability of free space, I is the current flowing through the loop, and r is the radius of the loop.
2018:
The magnetic field inside a long solenoid is given by:
B = μ0NI
where μ0 is the permeability of free space, N is the number of turns per unit length of the solenoid, and I is the current flowing through the solenoid.
2019:
The induced emf across the rod is given by:
ε = Blv
where ε is the induced emf, B is the magnetic field, l is the length of the rod, and v is the velocity of the rod.
2020:
The magnetic field at the centre of the coil is given by:
B = μ0NI/2r
where μ0 is the permeability of free space, N is the number of turns in the coil, I
