Two coils of self inductance and are connected in series combination having mutual inductance of the coils as . The equivalent self inductance of the combination will be :
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If current in both inductor is in same direction then
and, if current in both inductor is in opposite direction, then
When the current in a coil changes from . to . in ., an e.m.f. of 8 volt is induced in the coil. The coefficient of self inductance of the coil is
0.1 henry
0.4 henry
0.2 henry
0.8 henry
or
henry
Two coils of self inductances and 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
Mutual Inductance of two coils
The mutual inductance of a pair of coils is . If current in the primary coil changes from 0.5 A to zero in , find average induced e.m.f. in secondary coil.
Given : and
Average induced e.m.f. in secondary coil
The coefficient of self inductance of a solenoid is 0.18 . If a core of soft iron of relative permeability 900 is inserted, then the coefficient of self inductance will become nearly.
.... ( n and I are same)
The inductance of a closed-packed coil of 400 turns is 8 . A current of is passed through it. The magnetic flux through each turn of the coil is
Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon the
rate at which current change in the two coils
relative position and orientation of the coils
rate at which voltage induced across two coils
currents in the two coils
Mutual inductance of a pair of two coils depends on the relative position and orientation of two coils, other statements are incorrect.
Two solenoids of same cross-sectional area have their lengths and number of turns in ratio of both. The ratio of selfinductance of two solenoids is
Given and From
we get,
Two coils have a mutual inductance . The current changes in first coil according to equation where and . The max. value of e.m.f. in second coil is
A coil is wound on a frame of rectangular cross-section. If all the linear dimensions of the frame are increased by a factor 2 and the number of turns per unit length of the coil remains the same, self-inductance of the coil increases by a factor of
4
8
12
16
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