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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Faraday's law of electromagnetic Induction | RADIATION | physics

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The results of Faraday's Experiments on electromagnetic interaction are known as faraday's law  of electromagnetic induction. 

1.Faraday's First law of electromagnetic induction :-


Whenever magnetic flux linked with a circuit changes, induced EMF is produced. The induced emf losts as long as change in magnetic flux continue. 


2. Faraday's second Law of electomagnetic Induction :-


The magnitude of the emf is directly proportional to the rate of change of the magnetic flux linked with circuit.
               MATHEMATICALLY
               ε ∝ dΦ/dt
                
               ε= - kdΦ/dt 
Here - k is constant of proportionality .In SI k=1 ,-ve sign indicates that the induced emf gas got opposing nature ie direction of flow of current due to induced emf is such that it opposes the change in magnetic flux. 

       In SI
      E = - dΦ/dt .

• Importance of Faraday's Law:-

  The concept of electricity cannot complete without FARADAY'S LAW of induction .it describe how changing magnetic field can  cause electricity current to flow a conductor. The working of Electric motor and generator based on FARADAY'S LAW of induction. 

Faraday’s law looks at how changing magnetic fields can cause current to flow in wires.

•Application of faraday's Law:-

 1• Electrical generators which produces electricity works on the principle of electromagnetic induction.

2• Transformer which is used to change the voltage of the alternating current works on the principle of electromagnetic induction.

3•  Working of eletcrical bells are based on electromagnetic induction.

• Some important board exam level question answers :-


 Q. 1) Write Faraday's law of electromagnetic induction  ?

 Ans:- 

1.Faraday's First law of electromagnetic induction :-


Whenever magnetic flux linked with a circuit changes, induced EMF is produced. The induced emf losts as long as change in magnetic flux continue. 


2. Faraday's second Law of electomagnetic Induction :-


The magnitude of the emf is directly proportional to the rate of change of the magnetic flux linked with circuit.
               MATHEMATICALLY
               ε ∝ dΦ/dt
                
               ε= - kdΦ/dt 
Here - k is constant of proportionality .In SI k=1 ,-ve sign indicates that the induced emf gas got opposing nature ie direction of flow of current due to induced emf is such that it opposes the change in magnetic flux. 

      In SI
      E = - dΦ/dt .
Q. 2) Write Two applications of Faradays law of electromagnetic induction  ?

 Ans:-  1• Electrical generators which produces electricity works on the principle of electromagnetic induction.

2• Transformer which is used to change the voltage of the alternating current works on the principle of electromagnetic induction.




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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

-
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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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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