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Microwave oven is a simple yet amazing technological device which enables instant cooking.
Principle : Microwave radiation generated by a magnetron pass through the exposed food, create dielectric heating within the food, this is the basic principle on which a microwave oven works.
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Yogita Ingle 6 years ago
Bernoulli’s Principle
- For a streamline fluid flow, the sum of the pressure (P), the kinetic energy per unit volume (ρv2/2) and the potential energy per unit volume (ρgh) remain constant.
- Mathematically:- P+ ρv2/2 + ρgh = constant
- where P= pressure ,
- E./ Volume=1/2mv2/V = 1/2v2(m/V) = 1/2ρv2
- E./Volume = mgh/V = (m/V)gh = ρgh
Posted by Raja Kumar 6 years ago
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Yogita Ingle 6 years ago
Surface charge density is a measure of how much electric charge is accumulated over a surface. It is calculated as the charge per unit surface area. The SI unit of surface charge density is Cm–2.
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Yogita Ingle 6 years ago
When charged particle is placed in electric field , particle experience the electric force. direction of the force depends upon the sign of the charge.
If charge is positive then force is along the direction of electric field , charge is negative then force is opposite to the direction of electric field.
when electron is projected perpendicular to the uniform electric field , it experience the electric force in a direction opposite to the field. therefore it will follow the parabolic path.
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Yogita Ingle 6 years ago
We know that electric current or moving charges are source of magnetic field
A Small current carrying conductor of length dl (length element ) carrying current I is a elementary source of magnetic field .The force on another similar conductor can be expressed conveniently in terms of magnetic field dB due to the first
The dependence of magnetic field dB on current I ,on size and orientation of the length element dl and on distance r was first guessed by Biot and savart
The magnitude of the magnetic field dB at a distance r from a current element dl carrying current I is found to be proportional to I ,to the length dl and inversely proportional to the square of the distance |r|
The direction of the magnetic Field is perpendicular to the line element dl as well as radius r
Mathematically, Field dB is written as
Here (μ0/4π) is the proportionality constant such that μ0/4π=10-7 Tesla Meter/Ampere(Tm/A)
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Akanksha Singh 6 years ago
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