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Magnetic effect of electric current

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Due to passing of electric current through a conductor magnetic field generate around it this effect is called magnetic effect of current. Magnet a magnet is that substance which attracts ferromagnetic elements like iron Cobalt and nickel. When a bar magnet suspended freely from a thread its direction become North and South because Earth is also a huge magnet. Oersted experiment first of all in 1820 Christian oersted proved it by an experiment that when an electric current passing through a conductor it deflect compass needle perpendicular to the conductor  this experiment had proved that a current carrying conductor also produce magnetic field whose position is perpendicular to the the direction of flow of electric current. The force produced by magnetic field has both magnitude and direction and therefore it is a vector quantity and noted by B            Hans Christian oersted Magnetic field:  The area around a magnet where a magnetic force is experienced is called the magnetic field
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Image formation by a concave mirror // avatal darpan ke dawara pratibimb kaise banta h

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Concave mirror ke samane alg alg position me object rkhane pr image v alg alg position me banata h tatha uski image ki size , image ka sthan v alg alg hota h . 1) ydi object focus aur pole ke bich ho To image kalpnik (imaginary ), sidha (erect ) ,vastu se bada (magnified ) prapt hota h . Image darpan ke piche banata h . 2) ydi object focus pr ho to image anant (infinity ) pr bhut bada ,ulta ,aur vastavik (real ) banati h . 3)ydi object focus aur centre of curvature ke bich ho to image image centre of curvature aur infinity ke bich ulta ,bastu se bda tatha real image banata h . 4) ydi object centre of curvature pr rakha jaye to image vhi yani centre of curvature pr hi ulta ,vastavik tatha object ke barabar size me banta h . 5) ydi object infinity pr ho to parallel image mirror se reflect hokar focus pr ulta ,bastu se chota (diminished ) tatha vastavik image prapt hoti h .   👉  For more knowledge please visit my you tube chanel
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epathsala Kya hai ,epathsala ka use kaise kre

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epathsala NCERT ,CIET tatha Bharat sarkar ke manavsansadhan vikas mantralaya (Ministry of Human resourse development ) ke dawara sanjukt rup se develop Kiya gya ek education app or portel hai kiske dawara savi class ke bachhe NCERT ka koi v book ya koi v chapter off line download kr ya online padh sakate hai .  Es app me student ,teacher ,parents savi ke liye option hote hai. Aap es app ka use teen bhartiye bhasao me kr sakte h hindi ,English tatha urdu. . vises jankari ke liye mere you tube channel visit kre .link niche de raha hu . https://youtu.be/9Jaz4FTayVM             Thanks 
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SIGNAL SECTION DIGITAL AXLE COUNTER (PHASE REVERSAL TYPE ) SYSTEM ERROR CODES

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what is electric fuse ,what is pptc
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What is reflection of light ,what is a mirror ,plane mirror and spherical mirror

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https://youtu.be/_G9AlY0OdrY When a ray of light return back after striking a surface this is  called reflection of light . Laws of reflection 1-Incident ray ,reflected ray and point of incident exit in same surface . 2-Angle of incidence is equal to angle of reflection i.e  i=r . These laws of reflection are applicable to all types of reflecting surfaces including  plane and spherical surfaces . Mirror is an optical instrument by which we see or obtain image of a object .It is based on the principle of    reflection of light . Note - Opposite surface of a mirror is coated by silver and red paint .    Plane mirror that mirror whose reflecting surface is plane . Some important points related to a plane mirror 1) when an object moves with V m/s towards a plane mirror image velocity will be 2V m/s 2)The length of a plane mirror  should be  half length of a man to viewing his full image . 3)When a plane mirror rotated through thita angle ,the reflected ray moves through 2thita . 4)Number o
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What is a data logger? efftronics data logger in railway signalling

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A data logger is a electronic storage device which gives information. Here data means information and logger means electronic storage device. It is just like a black box in railway signalling. A data logger logs the information about the relays, which are connected to the data logger or remote terminal unit. Various analog supplies can also be connected to the data logger for monitoring the voltages. Image of a data logger unit The logged information by the data logger will be processed with the help of software in order to to empowered the monitoring system. the logged data are stored in the hard disk. this information can be viewed in the text format or Graphical format.This information is helpful to the user for knowing the working functionality of the signalling system and also analyzes the faults using different kinds of reports. The main usage of data logger   in railway is for preventive maintenance of various railway equipments and detecting the causes of faults. The da
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What is heat and temperature, conversion of temperature scales. What is a thermometer .

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Heat  is a form of energy which gives the sensation of hotness or coldness. Temperature  is   the degree of hotness or coldness.There are different scales to measure temperature and the instrument by which temperature can measure is called THERMOMETER . Name of different temperature scales 1- centigrade 2-Fahrenheite 3- Reaumer 4 -kalvin   Symbols are   used as C is used for centigrade F is used for fahrenheite R for Reaumer K for kalvin For different scales of measurement of temperature upper fixed value as boiling point and lower fixed value as melting points are taken. In case of Celsius scale , the upper fixed  point is taken as 100 degree  and the lower fixed point is taken as zero degree centigrade. In case of fahrenheit scale these are 212 degree and 32 degree. In case of reaumer scale these are taken as 80 degree and zero degree. In case of Kelvin scale these are taken as 373 and 273. Note- All those are divided into 100 equal parts and each part is called are calle
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