**Ohm’s Law** states that the current flowing in a circuit is directly proportional to the applied potential difference and inversely proportional to the resistance in the circuit. In other words, by doubling the voltage across a circuit the current will also double. However, if the resistance is doubled the current will fall by half.

**Most Important Laws of Physics**

**Most Important Laws of Physics**

Keywords: Newton Laws, Law of Conservation of Angular Momentum, Law of Conservation of Energy, Ohm Law, Newton Law of Universal Gravitation, Wien Displacement Law, Rayleigh Jeans Law, Tyndall Effect, Moore Law, Stefan-Boltzmann Law, Graham Law, Heisen Berg Uncertanity Principle, Lenz Law of Electromagnetic Induction, Faraday Law of Electromagnetism,

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Physics, the branch of science concerned with the nature and properties of matter and energy. Under many condition and situations we have laws (with derivation or without derivation)

These laws are built after various theoretical research, experiments or by using existing information, scientist concluded their various forms with proper justifications after completion of various scientific observations

This article will give you the information of most important laws you must know being a physics student.

**Newton Laws:**

He developed theories of gravitation, later he gave 3 laws of motion known as 1^{st} 2^{nd} and 3^{rd} law of motion stated as follows:

He stated as “ Newton’s first law states that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force. This postulate is known as the law of inertia.

The law defines a **force** to be equal to change in **momentum** (mass times velocity) per change in time. For an object with a constant mass **m**, the second law states that the force **F** is the product of an object’s mass and its acceleration **a**:

F = m * a

The **third law** states that for every action (force) in nature there is an equal and opposite reaction. In other words, if object A exerts a force on object B, then object B also exerts an equal force on object A.

**Law of conservation of angular momentum:**

The **law of conservation of angular momentum states** that when no external torque acts on an object, no change of **angular momentum** will occur.

**Faraday’s law of electromagnetism:**

**Faraday **states that a current will be induced in a conductor which is exposed to a changing magnetic field.

**Lenz’s law of electromagnetic induction****:**

It states that the direction of this induced current will be such that the magnetic field created by the induced current * opposes* the initial changing magnetic field which produced it. The direction of this current flow can be determined using Fleming’s right-hand rule.

**Heisenberg’s ****Uncertainty principle: **

The uncertainty principle is one of the most famous (and probably misunderstood) ideas in physics. It tells us that there is a fuzziness in nature, a fundamental limit to what we can know about the behavior of quantum particles and, therefore, the smallest scales of nature.

The position and momentum of a particle cannot be simultaneously measured with arbitrarily high precision. there is a minimum for the product of the uncertainties of these two measurements. There is likewise a minimum for the product of uncertainties of the energy and time.

**Law of conservation of energy:**

It states that energy can neither be created nor destroyed but it can be transformed from one form to another. Since energy cannot be created or destroyed, the amount of energy present in the universe is always remain constant.

**Graham’s Law:**

It states that the rates of diffusion of gases are inversely proportional to the square roots of their densities under similar conditions of temperature and pressure.

**Stefan**–**Boltzmann law**:

Statement says that the total radiant heat power emitted from a surface is proportional to the fourth power of its absolute temperature. The **law** applies only to blackbodies, theoretical surfaces that absorb all incident heat radiation.

**Moore’s law:**

Prediction made by American engineer Gordon Moore in 1965 that the number of transistors per silicon chip doubles every year.

**Tyndall effect**

The scattering of light by very small particles suspended in a gas or liquid.

**Ohm’s Law:**

**Ohm’s Law** states that the current flowing in a circuit is directly proportional to the applied potential difference and inversely proportional to the resistance in the circuit. In other words, by doubling the voltage across a circuit the current will also double. However, if the resistance is doubled the current will fall by half.

**Rayleigh jeans Law:**

An approximation in respect to thermal radiation: the emissive power of a blackbody at absolute temperature T and at a given wavelength λ is directly proportional to T and inversely proportional to λ^{4}. This law is only valid for long wavelength.

**Wien’s displacement law:**

It states that the black-body radiation curve for different temperatures will peak at different wavelengths that are inversely proportional to the temperature.

**Universal laws of gravity:**

**Newton’s law of universal gravitation** is usually stated as that every particle attracts every other particle in the universe with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers

The equation for universal gravitation thus takes the form:

F=G m1m2/r2

where *F* is the gravitational force acting between two objects, *m _{1}* and

*m*are the masses of the objects,

_{2}*r*is the distance between the centers of their masses, and

*G*is the gravitational constant.