First Part

In the toroidal coil of the figure below the outer radius is equal to 5cm and the
internal with 4cm. The core is made of ferromagnetic material, the
coil has 400 + 13 coils and is leaked by a current of 0.3 A. The relative magnetic
permeability of ferromagnetic material is 2000.
1. Calculate the magnetic flux Φ in the core.
2. Calculate magnetic induction B.

 

Second Part

The toroidal coil itself is made of ferromagnetic material M1929, and the coil
it has 400 + 13 spirals.
1. How much current will need to pass through the coil in order to grow
magnetic flux equal to 0.12 mWb.
2. How much current will need to pass through the coil in order to grow
magnetic flux equal to 0.06 mWb.

 

Imagine that in part E8, you had placed the compass due East of the wire. Draw two vector diagrams of the magnetic field felt by this compass: One with the current OFF and one with the current ON. Each diagram should show the magnetic fields from any relevant sources as well as a vector indiacating the total magnetic field. For this problem, assume that the current flows upwards (in diagram it is out of page).

60 A current is supplied in a long and straight wire P is a point at a distance of 40 cm from the wire. Then the wire is bended to a circular coil of radius of 40 cm the center of which is Q.

Calculate the magnitude of the magnetic field at point p

Using Biot-Savart law to find the magnitude of the magnetic field at the centre of a current carrying circular loop. 

 (ans in pdf please)