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.
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
The phenomenon of electromagnetic induction is
Name a common device that uses electromagnets.
Name two devices in which electromagnets are used and two devices where permanent magnets are used.
State whether the following statement are true or false:
A motor works on the principle electric generator?
Figure shows a wire sliding on two parallel, conducting rails placed at a separation l. A magnetic field B exists in a direction perpendicular to the plane of the rails. What force is necessary to keep the wire moving at a constant velocity v?
Using Ampere's law, obtain an expression for the magnetic induction near a current-carrying straight infinitely long wire.
Shown in the figure below is a metre bridge set up with null deflection in the galvanometer. The value of the unknown resistance R is ______
Ansari Sir was demonstrating an experiment in his class with the setup as shown in the figure below.
A magnet is attached to a spring. The magnet can go in and out of the stationary coil. He lifted the Magnet and released it to make it oscillate through the coil.
Based on your understanding of the phenomenon, answer the following question.
What is the principle which Ansari Sir is trying to demonstrate?
A coil of one turn is made of a wire of certain length and then from the same length, a coil of two turns is made. If the same current is passed in both the cases, then the ratio of the magnetic inductions at their centres will be:
The charge will flow through a galvanometer of resistance 200Ω connected to a 400Ω circular coil of 1000 turns wound on a wooden stick 20 mm in diameter, if a magnetic field B = 0.012 T parallel to the axis of the stick decreased suddenly to zero, is near ______.