Advertisements
Advertisements
प्रश्न
A coil of 200 turns carries a current of 4 A. If the magnetic flux through the coil is 6 x 10-5 Wb, find the magnetic energy stored in the medium surrounding the coil.
Advertisements
उत्तर
Given data:
N = 200 turns
i = 4A
ΦB = 6 × 10-5 Wb
Magnetic energy UB = ?
`"U"_"B" = 1/2 "Li"^2`
`therefore "U"_"B" = 1/2 ("N"phi_"B")/"i" "i"^2`
`"U"_"B" = 1/2 "N"phi_"B" "i"`
`= 1/2 xx 200 xx 6 xx 10 xx 4`
UB = 24 × 10-5 J
UB = 0.024 J
APPEARS IN
संबंधित प्रश्न
State three ways in which the strength of an electromagnet can be increased.
When a wire is moved up and down in a magnetic field, a current is induced in the wire. What is this phenomenon known as?
How is the working of an electric bell affected, if alternating current be used instead of direct current?
In which of the following case does the electromagnetic induction occur?
The current is stopped in a wire held near a loop of wire .
What is an electromagnet?
The diagram shows a rectangular coil ABCD, suspended freely between the concave pole pieces of a permanent horseshoe magnet, such that the plane of the coil is parallel to the magnetic field.
- State your observation when the current is switched on.
- Give an explanation for your observation in (i).
- State the rule, which will help you to find the motion of rotation of the coil.
- In which position will the coil ultimately come to rest?
- State four ways of increasing the magnitude of force acting on the coil.
Using Ampere's law, obtain an expression for the magnetic induction near a current-carrying straight infinitely long wire.
A thin semi-circular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in the figure.
The potential difference developed across the ring when its speed v , is
Obtain an expression for motional emf from Lorentz force.
An alternating emf of 0.2 V is applied across an L-C-R series circuit having R = 4Q, C = 80µF, and L = 200 mH. At resonance the voltage drop across the inductor is
