Q.1.
An open coil has
Q.2.
The self inductances of two coils are 8 mH and 18 mH. If the coefficient of coupling is 0.5, the mutual inductance of the coils is
Q.3.
Reversing the field or the current will reverse the force on the conductor.
Q.4.
The coefficient of coupling between two air core coils depends on
Q.5.
The law that the induced e.m.f. and current always oppose the cause producing them is due to
Q.6.
The core of a coil has a length ofmm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be
Q.7.
Mutually inductance between two magnetically coupled coils depends on
Q.8.
Lenz's law is a consequence of the law of conservation of
Q.9.
A crack in the magnetic path of an inductor will result in
Q.10.
A conductor carriesamperes of current underto a magnetic field of 1.1 tesla. The force on the conductor will be nearly
Q.11.
The magnitude of the induced e.m.f. in a conductor depends on the
Q.12.
An average voltage ofV is induced in aturns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is
Q.13.
In case of an inductance, current is proportional to
Q.14.
A laminated iron core has reduced eddy-current losses because
Q.15.
The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit Weber turns.
Q.16.
The inductance of a coil will increase under all the following conditions except
Q.17.
As per Faraday's laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it
Q.18.
Air-core coils are practically free from
Q.19.
Higher the self-inductance of a coil,
Q.20.
In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will