Question

Ques. How does the mutual inductance of a pair of coils kept co-axially at a distance in air change when
a. the distance between three coils is increased?
b. an iron rod is kept between them?

Answer 1

Answer:

Explanation:

Mutual induction of a pair of coil affected,

(i) When the distance between the coil is increased, magnetic flux linked with the secondary coil get decreases and mutual induction of pair of coil decreases.

(ii) when an thin iron rod is kept between them, mutual induction will get increases due the the relation as

M×μr

Where M is mutual induction and μr is the relative magnetic permeability.

HoPe hELpS yu^-^!

Answer 2

when distance increases

magnetic field decreases

as magnetic field = u0 i n/L

As length increases field decreases

As flux is BA so field decreases flux decreases

As flux Is directly proportional to mutual inductance

So if flux decrease mutual inductance decrease

b) when iron rod is kept between them

then medium permeability gets increased , as mutual inductance is directly proportional to permeability So mutual inductance increases