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प्रश्न
In which of the following case does the electromagnetic induction occur?
A loop of wire is held near a magnet.
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उत्तर
No.
संबंधित प्रश्न
Name one device which works on the phenomenon of electromagnetic induction.
A transformer has 400 turns in the primary winding and 10 turns in the secondary winding. The primary e.m.f. is 250 V and the primary current is 2.0 A. calculate:
(a) The secondary voltage,
(b) The secondary current, assuming 100% efficiency.
Answer the following:
State the principles of the electric motor and electric generator.
Why soft iron is preferred to be used as the core of the electromagnet of an electric bell?
Obtain an expression for motional emf from Lorentz force.
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 ______
A layer of atmosphere that reflects medium frequency radio waves which is ineffective during night, is ______.
The condition for the praenomen of electromagnetic induction is that there must be a relative motion between ____________.
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:
In the given circuit, initially switch S1 is closed and S2 and S3 are open. After charging of capacitor, at t = 0, S1 is open and S2 and S3 are closed. If the relation between inductance capacitance and resistance is L = 4CR2 then the time (in sec) after which current passing through capacitor and inductor will be same is ______ × 10-4 N. (Given R = ℓn(2)mΩ, L = 2mH)
