Ayati Coaching Classes 91-7835812169

Ayati Coaching Classes 91-7835812169 Coaching classes for 5th to 10th (All Subjects), 11th & 12th (Physics). Emphasize on Basics & Advanced methods. Special Batches to improve Basics.

28/12/2019

Relationship between Angle of Repose and and Angle of Friction - Angle of repose is defined as the minimum angle made by an inclined plane with the horizontal such that an object placed on the inclined surface just begins to slide.
Relation between Angle of Friction and Angle of Repose
Let us consider a body of mass ‘m’ resting on a plane.

Also, consider when the plane makes ‘θ’ angle with the horizontal, the body just begins to move.

Let ‘R’ be the normal reaction of the body and ‘F’ be the frictional force.

Here,

mgsinθ = -F ——> (i)



mgcosθ = -R ——>(ii)

Dividing equation (i) by (ii)

Or, Tanθ = µ, where ‘µ’ is the coefficient of friction
Or, Tanθ = Tanɑ (tanɑ = µ)

where ‘ɑ’ is the angle of friction

θ = ɑ
Angle of repose is equal to angle of friction.

08/12/2018

Faraday's first law of electromagnetic Induction - According to first law whenever magnetic flux linked with conductor or coil changes and electromotive force (e. m.f.) is induced in it. This induced e. m. f last as long as the change in magnetic flux continues in the coil. Faraday Second law states that magnitude of induced e.m.f is directly proportional to the rate of change of magnetic flux linked with the conductor or coil.

10/11/2018

Charles law- This law gives relationship between volume and temperature of a gas at constant pressure.it was discovered by Alexander Charles in 1787. it states that if the pressure remain constant , then the volume of a given mass of a gas increase or decrease by 1 / 273.15 of its volume at zero degree celsius for each one degree rise or fall of temperature. Charles Law can be stated in another way. Pressure remains constant, the volume of a given mass of a gas is directly proportional to its absolute temprture. There will be straight line graph between volume and temperature of a given mass of a gas at constant pressure.

18/05/2018

Newton third law states that whenever objects A and B interact with each other, they exert forces upon each other. When you sit in your chair, your body exerts a downward force on the chair and the chair exerts an upward force on your body. There are two forces resulting from this interaction - a force on the chair and a force on your body. These two forces are called action and reaction forces. But the direction of these two forces will be opposite to each other. Formally stated, Newton's third law is:
For every action, there is an equal and opposite reaction.

19/04/2018

Fleming’s left hand rules when we stretch our left hand fingers in below position. Then thumb will give direction of motion. Adjacent finger will tell us direction of magnetic field and middle finger will tell direction of current.

04/04/2018

Starting batches for science and Mathematics for classes from 6th-10th and Physics for classes 11th to 12th. Location is Jyoti Nagar Kurukshetra. Weekly tests series and emphasize on basics to get higher score in competition exams. Contact 91-7835812169

24/03/2018

Some cases and facts about Gauss law in electric field- The electric flux through a closed surface is depend upon the total charge enclosed by the closed surface. Electric flux does not depend upon the size of the area. Electric field is same on the whole surface due to constant radius r of the sphere. Electric field and area vector ds is parallel to each other. Therefore cos theta will be zero degree means will be equal to one. The charge outside the closed surface will not effect the electric flux through the closed surface. The electric field lines entering the closed surface called as negative flux and the electric field lines leaving the closed surface is positive flux.

21/03/2018

Polar molecule - if the centre of mass of positive charges like Proton doesn't coincide with the centre of mass of negative charges like electron then the molecule is said to be a polar molecule. A substance or material consisting of Polar molecule is known as a polar substance. Polar molecule in the substance has a permanent dipole moment. Water being a polar molecule behave like an electric dipole. The electric dipole moment of water molecule is quite large. Water H2+ O- being electric dipole act as a very good solvent for ionic substance like salt or sodium chloride Na+ Cl-. when sodium chloride is added to water it dissociates into sodium ion and chloride Ion. The positive ion is attracted towards the centre of mass of negative charge of water molecule and Negative Ion is attracted towards the centre of mass of positive charge of water molecules Thus the ions are held in solutions

16/03/2018

Electric Dipole and Electric Dipole Moment - A pair of two equal and opposite charges separated by a certain distance is called electric dipole. Electric dipole moment of an electric dipole is defined as the product of the magnitude of either dipole and dipole length. p = q. 2l where P is dipole moment, 2l is the length of dipole and q is the charge. S. I unit of dipole moment is colours metre.

08/03/2018

Boyle's law- it is a fundamental gas law discovered in 1662 it states that the volume of a given mass of a gas is inversely proportional to its pressure provided temperature remain constant. PV=K. Where P is pressure, V is volume and K is constant. It's value depends upon mass of gas, its temperature, and the units in which P and V are measured.

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