Advertisements
Advertisements
प्रश्न
An induced current of 2.5 mA flows through a single conductor of resistance 100 Ω. Find out the rate at which the magnetic flux is cut by the conductor.
Advertisements
उत्तर
Given data:
Induced current i = 2.5 mA
i= 2.5 × 10-3 A
Resistance R = 100Ω
ε = `("d"phi_"B")/"dt"`
where ε = iR
`therefore ("d"phi_"B")/"dt"` = iR = 2.5 × 10-3 × 100
= 250 × 10-3
= 250 mWbs-1
APPEARS IN
संबंधित प्रश्न
What is an electromagnet? Describe the construction and working of an electromagnet with the help of a labelled diagram.
An induced current is produced when a magnet is moved into a coil. The magnitude of induced current does not depend on:
(a) the speed with which the magnet is moved
(b) the number of turns of the coil
(c) the resistivity of the wire of the coil
(d) the strength of the magnet
Show diagrammatically how an alternating emf is generated by a loop of wire rotating in a magnetic field. Write the expression for the instantaneous value of the emf induced in the rotating loop.
Fill in the blanks by writing (i) Only soft iron, (ii) Only steel, (iii) Both soft-iron and steel for the material of core and/or magnet.
Transformer______.
Answer the following:
State the principles of the electric motor and electric generator.
State Lenz’s law.
Obtain an expression for motional emf from Lorentz force.
A cylindrical bar magnet (A) and similar unmagnetized cylindrical iron bar (B) are dropped through metallic pipe. The time taken to come down by ____________.
Sea turtles return to their birth beach many decades after they were born due to ______.
Show that for a given positive ion species in a cyclotron, (i) the radius of their circular path inside a dee is directly proportional to their speed, and (ii) the maximum ion energy achievable is directly proportional to the square of the magnetic induction.
