current | resistivity | Current electricity | ohm law | electric current | physics

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Current electricity and ohm's law(Current electricity) :- •What is current? Rate of flow of electric charge with time through any cross section of a wire is called current. It is denoted by I . Thus if charge "dq" flows through a wire in small time "dt" then electric current through wire is given by :                                             I=dq/dt  1 ampere = 1coulomb/1 second  1A=C/s •Ampere :-                                                           The current Through a wire is called one ampere if one coulomb charge is flow through Any cross section of wire in one second   •Ohm's law:- Ohm’s principal discovery was that the amount of electric current through a metal conductor...
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Reflection of light and Law of reflection | optics | physics

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Reflection of light (Optics)  :-  


•Reflection :-

The phenomenon in which the light traveling in a medium ,when made incident on the surface of another medium goes back in the same medium is called reflection .

•Law of reflection :-


The following experiments observation are called laws of reflection. 

1. The incident ray, the normal to reflecting surface at the point of incident and reflected ray all lie in same plane. 


2. The angle of incidence(i) is always equal to angle of reflection (r). 
             i=r


•Some definitions:-

• Incident Ray:-
The incident light ray is a narrow light beam which is represented by a straight line, it intersects with the reflecting surface at the point of incidence.

•Reflected Ray:-
The reflected light ray is a narrow light beam which is represented by a straight line that is reflected from the reflected surface at the point of incidence.

•Angle of Incidence :-
The angle of incidence is the angle between the incident light ray and the line perpendicular to the reflecting surface at the point of incidence.

•Angle of reflection :-
The angle of reflection is the angle between the reflected light ray and line perpendicular to the reflecting surface at the point of incidence.

 

•Some important board exam level question answers :-


Q. 1) What is Reflection of light ?

Ans:-  The phenomenon in which the light  traveling in a medium ,when made   incident on the surface of another medium goes back in the same medium is called reflection .


Q. 2) What is the relation between Incidence ray and Reflected ray ?

 Ans:-  The angle of incidence(i) is always equal to angle of reflection (r). 
                          i=r
Q. 3) Write the law of reflection  ?

 Ans:-  The following experiments observation are called laws of reflection.

1. The incident ray, the normal to reflecting surface at the point of incident and reflected ray all lie in same plane.

 2.The angle of incidence(i) is always equal to angle of reflection (r). 
             i=r





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Physics

Electric lines of force (electrostatic) | electostatic | physics

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 •  Electric lines of force        (Electrostatics)  1. The electric lines of force start from positive charge and end at negative charge.      2.  The lines of forces originate or terminate at a surface is always right angle to that surface. 3. The lines of forces never intersect each other. 4. The electric lines of force do not pass through a conductor. 5.Like charges repel each other wherever unlike charges attracted each other  • Some important Question Answer From Board level Exams:- Q. 1) Why electric field lines of force cannot intersect each other?   Ans:- This is because at the point of intersection, two tangent would have to be drawn to the lines of Force. Therefore would be two directions of electric intensity at the same point, which is not possible.  Q. 2) Write Two properties of electric field lines of force?  Ans:-    1. The lines of forces ...
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current | resistivity | Current electricity | ohm law | electric current | physics

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Image
Current electricity and ohm's law(Current electricity) :- •What is current? Rate of flow of electric charge with time through any cross section of a wire is called current. It is denoted by I . Thus if charge "dq" flows through a wire in small time "dt" then electric current through wire is given by :                                             I=dq/dt  1 ampere = 1coulomb/1 second  1A=C/s •Ampere :-                                                           The current Through a wire is called one ampere if one coulomb charge is flow through Any cross section of wire in one second   •Ohm's law:- Ohm’s principal discovery was that the amount of electric current through a metal conductor...
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Electric field (electrostatic) | electostatic | physics

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Electric field (Electrostatics)  . The space around a charge in which any other charge is acted upon by an electrostatic force is called electric field of charge .                   E = F/q.                  We know that,           F = k Qq. / r 2            Therefore                 E = k Qq. / r 2 *1/q.                      E =kQ/ r 2   The charge "Q" due to which electric field is set up is called source charge and the other charge "q." which experience electrostatic force in the electric field is called test charge . Electric field intensity :- The electric field intensity or electric field strength at a point due to a source charge may be defined as the electrostatic force per unit positive charge a...
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State and prove the Gauss's Theorem (electrostatic) | electostatic | physics

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Gauss’s Theorem (Electrostatic)   Statement:- According to Gauss’s theorem the net-outward normal electric flux through any closed surface of any shape is equivalent to 1/ε0 times the total amount of charge contained within that surface. Proof of Gauss’s Theorem Statement:- Let the charge be = q Let us construct the Gaussian sphere of radius = r Now, Consider , A surface or area ds having ds (vector) Normal having the flux at ds: d e = E (vector) d s (vector) cos θ But , θ = 0 Therefore, Total flux: C = f d Φ E 4 π r2 Therefore, σ = 1 / 4πɛo q / r2 × 4π r2 σ = q / ɛo • Some important board exam level question answers:- Q. 1) Write Gauss's theorem for a charge outside a closed surface.  Ans:- The theorem becomes zero.  Q. 2) What is an equipotential surface ? Ans:- A surface, which has same electric   potential everywhere on it is called   equipotential surface.  Ask me qu...
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