EM And EMI

Question 1

Define magnetic field

Answer 1

Magnetic field is an area where the poles of a magnet experience a force

Question 2

Define magnetic flux density

Answer 2

Magnetic flux density is numerically equal to the force per unit Length of straight wire carrying a unit current perpendicular at right angles to a uniform magnetic field

Question 3

Define a tesla

Answer 3

One tesla is the uniform magnetic flux density which acting normally to a Long straight wire carrying 1 ampere, causes a force per unit length of 1Nm^-1 on the wire

Question 4

What is faradays law

Answer 4

Faraday’s law of electromagnetic induction states that the induced emf is proportional to the rate of change of magnetic flux linkage

Question 5

What is magnetic flux

Answer 5

Magnetic flux is the product of the magnetic flex density and the area normal to the flux

Question 6

What is magnetic flux linkage

Answer 6

Magnetic flux linkage of a coil is the product of the magnetic flux passing through the coil and the no. Of turns on the coil

Question 7

What is lenz law

Answer 7

Lenz’s law states that the diraction of the induced emf is such as to create effects which oppose the change producing it