Tag: mutual inductance
Questions Related to mutual inductance
The coefficient of mutual inductance between two coils depends on
Two coils of self inductances 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is:
A circular copper disc 10 cm in diameter rotates at 1800 revolution per minute about an axis through its centre and at right angles to disc. A uniform field of induction B of 1 Wb $m^2$ is perpendicular to disc. What potential difference is developed between the axis of the disc and the rim ?
Mutual inductance of two coils can be increased by
If the self inductance of 500 turns coil is 125 mH, then the self inductance of the similar coil of 800 mH
The mutual inductance $M _{12}$ of a coil 1 with respect to coil 2
Match the following:
Quantity | Formula |
---|---|
1) Magnetic flux linked with a coil | a) $\displaystyle -N\frac { d\phi }{ dt } $ |
2) Induced emf | b) $\displaystyle { \mu } _{ r }{ \mu } _{ 0 }{ n } _{ 1 }{ n } _{ 2 }{ \pi r } _{ 1 }^{ 2 }l$ |
3) Force on a charged particle moving in a electric and magnetic field | c) $\displaystyle BA\cos { \theta } $ |
4) Mutual inductance of a solenoid | d) $\displaystyle q\left( \overline { E } +\overline { v } \times \overline { B } \right) $ |
In the method using the transformers, assume that the ratio of the number of turns in the primary to that in secondary in the step-up transformer is $1:10$. If the power to the consumer has to be supplied at $200\ V$, the ratio of the number of turns in the primary to that in the secondary in the step-down transformer is:
An inductor of inductance $100\ mH$ is connected in series with a resistance, a variable capacitance and an AC source of frequency $2.0\ kHz$; The value of the capacitance so that maximum current may be drawn into the circuit.
$5 \mathrm { mV }$ is induced in a coil, when current in another nearby coil changes by $5 \mathrm { A }$ in $0.1$sec. The mutual inductance between the two coils will be