magnetic filed due to passing the current in circular loop

Question 1

EXPERIMENT on the circuler coil

Answer 1

1. Throw iron filling on a card- board surrounding circular loop carrying an electric current
2. Knock the corner of the card- board slightly.
3. Observation

• The iron filling will arranged as

1. the magnetic flux lines are no longer circular
2. the magnetic flux density changes from point to another
3. at the center of the coil the magnetic flux lines are uniform parallel to each other and to the axis of the coil
4. at the center of the coil the magnetic flux lines are perpendicular to the coil,s plane
5. it looks like a short magnet

Question 2

calculate magnetic flux density (B) at the center of the coil calculated from the relation

Answer 2

B_{at center} = µ x NI / 2r_coil

NOTE you can calculate magnetic flux density (B) at the center only

Question 3

Factor which the magnetic flux density at point (B) depends on and the ratio

Answer 3

1. The electric current intensity B & I a constant other factors
2. the number of turns of the coil B&N at constant other factor
3. The magnetic permeability of the medium B&µ at constant other factor
4. the radius of the coil B& 1/r at constant other factor

ratio

B₁/B₂ =µ₁ / µ₂ x I₁ / I₂ x N₁/N₂ x r₂/r₁

Question 4

The dirction of the magnetic filled can be determined by using

Answer 4

1. Small compass
2. Ampere right hand rule
3. maxwell right hand screw rule
4. polarity

Question 5

if you have a wire in form of coincident circles what is the relation to obtain number of turns

Answer 5

number of turns = length of the wire \ circumference ( 2πr )