An open coil has

Related MCQs

• 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 ?
• 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
• 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 in ductance will be
• The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as
• In case all the flux from the current in coil 1 links with coil 2, the co-efficient of coupling will be
• A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by
• The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength ?
• 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 coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is
• When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon