Advertisements
Advertisements
Question
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
Solution
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
RELATED QUESTIONS
- What kind of energy change takes place when a magnet is moved towards a coil having a galvanometer at its ends?
- Name the phenomenon.
In which of the following case does the electromagnetic induction occur?
The current is stopped in a wire held near a loop of wire .
Welders wear special glass goggles while working. Why? Explain.
Calculate the dimensions of (a) \[\int \overrightarrow{E} . d \overrightarrow{l,}\] (b) vBl and (c) \[\frac{d \Phi_B}{dt}.\] The symbols have their usual meaning.
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.
What for an inductor is used? Give some examples.
A square coil of side 30 cm with 500 turns is kept in a uniform magnetic field of 0.4 T. The plane of the coil is inclined at an angle of 30° to the field. Calculate the magnetic flux through the coil.
If the sun radiates energy at the rate of 3.6 × 1033 ergs/sec the rate at which the sun is loosing mass is given by ______.
Induced current flows through a coil ______.
Which type of force is experienced by a moving charge in a magnetic field?
