Advertisements
Advertisements
प्रश्न
State Fleming’s right-hand rule.
Advertisements
उत्तर
- The Thumb, index finger, and middle finger of the right hand are stretched perpendicular to each other.
- The index finger indicates the direction of the magnetic field.
- Thumb indicates the direction of motion of the conductor.
- The middle finger indicates the direction of induced current.
APPEARS IN
संबंधित प्रश्न
Write some of the important uses of electromagnets.
The most suitable material for making the core of an electromagnet is:
(a) soft iron
(b) brass
(c) aluminium
(d) steel
Describe one experiment to demonstrate the phenomenon of electromagnetic induction.
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.
A conducting rod is moved with a constant velocity v in a magnetic field. A potential difference appears across the two ends _____________ .
L, C and R represent the physical quantities inductance, capacitance and resistance respectively. Which of the following combinations have dimensions of frequency?
(a) `1/(RC)`
(b) `R/L`
(c) `1/sqrt(LC)`
(d) C/L
The following diagram shows a fixed coil of several turns connected to a center zero galvanometer G and a magnet NS which can move in the direction shown in the diagram.
- Describe the observation in the galvanometer if
- The magnet is moved rapidly,
- The magnet is kept still after it has moved into the coil
- The magnet is then rapidly pulled out the coil.
- How would the observation in (i) of part (a) change if a more powerful magnet is used?
Using Ampere's law, obtain an expression for the magnetic induction near a current-carrying straight infinitely long wire.
What for an inductor is used? Give some examples.
A closely wound circular coil of radius 0.02 m is placed perpendicular to the magnetic field. When the magnetic field is changed from 8000 T to 2000 T in 6 s, an emf of 44 V is induced in it. Calculate the number of turns in the coil.
