Electromagnetic Induction Archives

In case all the flux from the current in coil 1 links with coil 2, the co-efficient of coupling will be____________?

In case all the flux from the current in coil 1 links with coil 2, the co-efficient of coupling will be____________?

A. 2.0
B. 1.0
C. 0.5
D. zero

In case all the flux from the current in coil 1 links with coil 2, the co-efficient of coupling will be____________? Read More »

Electromagnetic Induction

A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be___________?

Electromagnetic Induction / admin

A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be___________?

A. 6 mH
B. 14 mH
C. 24 mH
D. 48 mH

A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be___________? Read More »

Electromagnetic Induction

The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is 0.5, the mutual inductance of the coils is______________?

Electromagnetic Induction / admin

The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is 0.5, the mutual inductance of the coils is______________?

A. 4 mH
B. 5 mH
C. 6 mH
D. 12 mH

The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is 0.5, the mutual inductance of the coils is______________? Read More »

Electromagnetic Induction

In case of an inductance, current is proportional to___________?

Electromagnetic Induction / admin

In case of an inductance, current is proportional to___________?

A. voltage across the inductance
B. magnetic field
C. both A. and B.
D. neither (A) nor (B)

In case of an inductance, current is proportional to___________? Read More »

Electromagnetic Induction

For a purely inductive circuit which of the following is true ?

Electromagnetic Induction / admin

For a purely inductive circuit which of the following is true ?

A. Apparent power is zero
B. Relative power is.zero
C. Actual power of the circuit is zero
D. Any capacitance even if present in the circuit will not be charged

For a purely inductive circuit which of the following is true ? Read More »

Electromagnetic Induction

An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be______________?

Electromagnetic Induction / admin

An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be______________?

A. 64 A/s
B. 32 A/s
C. 16 A/s
D. 4 A/s

An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be______________? Read More »

Electromagnetic Induction

Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be______________?

Electromagnetic Induction / admin

Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be______________?

A. 32 mH
B. 38 mH
C. 40 mH
D. 48 mH

Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be______________? Read More »

Electromagnetic Induction

The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be_____________?

Electromagnetic Induction / admin

The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be_____________?

A. 3 mH
B. 12 mH
C. 24mH
D. 48mH

The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be_____________? Read More »

Electromagnetic Induction