Related Questions

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
A Increase
B Decrease
C Remain the same
D Initially increase and then decrease
A certain amount of current flows through a ring shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil?
A Decreases
B Increases
C Remains same
D First increases and then decreases depending on the depth of iron in¬sertion
একটি স্টেপ আপ ট্রান্সফরমারে, গৌণ কুণ্ডলীর পাকসংখ্যা মুখ্য কুন্ডলীর পাকসংখ্যার দ্বিগুণ। যদি মূখ্য কুন্ডলীকে কোন পরিবর্তী বিদ্যুৎ লাইনের সাথে সংযুক্ত করা হয়, তাহলে মুখ্য কুণ্ডলীর তুলনায় গৌণ কুণ্ডলীতে- (In a step up transformer, the number of turns in the secondary coil is twice to that of primary coil. If you apply an alternating current in the primary coil, then in the secondary coil compared to the primary coil-)
A তড়িৎ প্রবাহের মান দ্বিগুণ হবে (current will be doubled)
B তড়িৎ প্রবাহের মান অর্ধেক হবে (current will be halved)
C তড়িৎ বিভবের মান অর্ধেক হবে (voltage will be halved)
D তড়িৎ প্রবাহের মান সমান থাকবে (Current will remain the same)
When number of turns in a coil is trippled, without any change in the length of coil, its self inductance becomes?
A Nine times
B Three times
C Six times
D One–third
A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will
A Increase
B Decrease
C Remain constant
D Be excessive
The inductance of a coil can be increased by
A Increasing core length
B Decreasing the number of turns
C Decreasing the diameter of the former
D Choosing core material having high relative permeability
Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be
A Unaffected
B Doubled
C Halved
D Quadrupled
Higher the self-inductance of a coil,
A Lesser its weber-turns
B Lower the e.m.f. induced
C Greater the flux produced by it
D Longer the delay in establishing steady current through it
The inductance of a coil will increase under all the following conditions except
A When more length for the same number of turns is provided
B When the number of turns of the coil increase
C When more area for each turn is provided
D When permeability of the core increases
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.
A Yes
B No

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