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    • Posted by Ankit Kumar 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Gaurav Seth 6 years, 11 months ago

    AC Generator

    • An electrical generator is a device that converts mechanical energy to electrical energy.
    • The generation of alternating currents (ac) is based on the phenomenon of electromagnetic induction.
    • Whenever the magnetic flux changes an emf will be induced in the coil.
    • AC generator is a device that converts mechanical energy into electrical energy(alternating currents).
    • AC generator is an example of inducing an emf or current in a loop by varying the magnetic field and area vector.

    Principle:-

    • Current is induced in a loop through a change in its orientation or a change in its effective area.
    • Induced emf is produced either by changing θ or by changing the area vector.
    • Direction of current is given by Fleming’s right hand rule.
    • Direction of the current in the circuit changes by the up and down movement of the loops.

    Construction:-

    • It consists of 2 poles(north and south) of a magnet in order to have uniform magnetic field.
    • There is a coil of rectangular shape also known as armature.
    • The armature is connected to 2 slip rings.
    • Slip rings helps in electrical contact with the brushes.It does not change current direction.
    • The slip rings provide a continuous connectionwith the wire around the armature.
    • These slip rings are attached to carbon brushes.
    • The rectangular coil is capable of rotating about an axis which is perpendicular to the magnetic field.
    • The axis of rotation is known as axle.

     

    Working:-

    • At initial time t=0;θ =0 where θ = angle between magnetic field (B) and area vector.
    • Magnetic flux Φ =BA as cos 0 =1.
    • When the coil rotates with the angular velocity ω;
    • After time t, θ = ωt;
    • Φ(t) =BA cosθ = BA cosωt (because θ is changing as a result magnetic flux is also changing)
    • Therefore change in flux occurs; By Faraday’s Law there will be induced emf.
    • Induced emf e=- N (dΦ/dt); where N = number of turns.
    • = –Nd(BA cosωt)/dt
    • e=NBAωsinωt
    • As sinωt is a periodic function,therefore it varies from -1 to +1.
    • Minimum value of e= - NBAω and maximum value of e=+ NBAω.
    • Therefore e =e0sinωt where e0=NBAω
    • Therefore Induced current will change periodically.
    • As the current is changing periodically that is why it is called as alternating current.
    • Rod is getting rotated by some external means; therefore rotation of rod is mechanical energy.
    • This mechanical energy is getting converted toinduce emf because of which induced current is produced.
    • Therefore because of mechanical energy alternating current is generated.As a result electrical energy is generated.

    1Thank You

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    • Posted by Vishal Sha 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Brajesh Kumar 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Pragya Gupta 6 years, 11 months ago

    B=m°I

    0Thank You

    Vishal Sha 6 years, 11 months ago

    It States that the line integral of the magnetic field B around any closed path in free space is equal to absolute permitivity (nue zero) times the net current I passing through the surface enclosed by the path.

    3Thank You

    ANSWER

    • Posted by ????? ???? 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Dev Joshi 6 years, 11 months ago

    Penetrating power is the power of the radiations to penetrate a surface e.g.-on comparison of A,B,and gama rays gamma rays has the most penetrating power it can penetrate an iron wall of 30 cm.

    1Thank You

    Sanjay Singh 6 years, 11 months ago

    Escape from any surface

    1Thank You

    ANSWER

    • Posted by Hasan Ali 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Mansi Gupta 6 years, 11 months ago

    What??

    3Thank You

    ANSWER

    • Posted by Riya R 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Sanjay Singh 6 years, 11 months ago

    m sq. Per Vs

    0Thank You

    Isha Dahiya 6 years, 11 months ago

    Cs per kg

    0Thank You

    ANSWER

    • Posted by Hasan Ali 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Gyandeep Srivastava 6 years, 11 months ago

    really

    0Thank You

    Anshika Choudhary 6 years, 11 months ago

    What?

    0Thank You

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    • Posted by Rajat Dhull 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Anjali Mishra 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 4 answers

    Shama Shama Sheikh 6 years, 11 months ago

    In physics you are prepare derivation and ncert example and back question after completing this you start arihant chapter wise question

    0Thank You

    Shaikh Umar 6 years, 11 months ago

    By serial wise

    0Thank You

    Anshika Choudhary 6 years, 11 months ago

    Hehe

    0Thank You

    Priyanshu Pandey 6 years, 11 months ago

    Don't study

    0Thank You

    ANSWER

    • Posted by Manish Gupta 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Uttam Kumar 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Harshit Asthana 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Vishal Sha 6 years, 11 months ago

    And digital signals

    0Thank You

    Vishal Sha 6 years, 11 months ago

    Analog signals

    0Thank You

    ANSWER

    • Posted by Harshit Asthana 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Navya Singh 6 years, 11 months ago

    Analog and digital

    0Thank You

    ANSWER

    • Posted by Sonu Rathi 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Sanjeev Pandit 6 years, 11 months ago

    Gauss law and its application +dipole at axial & eqitorial position +coulomb law+electric field and field lines

    3Thank You

    ANSWER

    • Posted by Shivam Sharma 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Sanjeev Pandit 6 years, 11 months ago

    First read all defintion of a chapter.. Then formula and then practice derivations & numericals.. Repeat this in all chapter to get 90%marks

    4Thank You

    ANSWER

    • Posted by Shahnaj Ali 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Mobasshir Alam 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Sham Lal 6 years, 11 months ago

    4:1

    0Thank You

    ANSWER

    • Posted by Sathya Murthy 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Suresh Kumar Awasthi 6 years, 11 months ago

    Acc.to this law the magnitude of force of attraction or replusion between any two point charges at rest is directly proptional to the product of magnitude of charges and inversily proportional to the square of its distance between them

    2Thank You

    ANSWER

    • Posted by Priyanshu Singh 5 years, 8 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Rajat Dhull 6 years, 11 months ago

    Yes it is proved already by scientists

    3Thank You

    ANSWER

    • Posted by Kapil Verma 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Sachin Bhati 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Yuvaraj Singh Thakur 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Yuvaraj Singh Thakur 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Yuvaraj Singh Thakur 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Saurav Kumar 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Yuvraj Patel 6 years, 11 months ago

    P=2aq,where P is dipole moment, 2a is distance between two dipole and qis charge

    1Thank You

    Yogita Ingle 6 years, 11 months ago

    It is basically the exact measure of the strength associated with an electric dipole. Based on scientific and mathematical conclusions, the dipole moment magnitude is the product of either of the charges and the separation distance (d) between them. Do remember that, the dipole moment is a vector measure whose direction runs from negative to positive charge.

    The formula for electric dipole moment for a pair of equal & opposite charges is p = qd, the magnitude of the charges multiplied by the distance between the two.

    0Thank You

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    • Posted by Saurav Kumar 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Yogita Ingle 6 years, 11 months ago

    An electric dipole is a pair of equal and opposite point charges q and –q, separated by a distance of 2a.

    • Direction from –q to q is the direction of the dipole.
    • The mid-point of locations of –q and q is called the center of the dipole.

    0Thank You

    ANSWER

    • Posted by Shalini Shakya 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 4 answers

    Ayush Dubey 6 years, 11 months ago

    17 marks

    0Thank You

    Tanushri Jhod 6 years, 11 months ago

    Ya she is right

    1Thank You

    Rajat Dhull 6 years, 11 months ago

    Bas itne se marks k

    1Thank You

    Mansi Gupta 6 years, 11 months ago

    Around 10-15 marks

    1Thank You

    ANSWER

    • Posted by Sourabh Rajpal 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Rajat Dhull 6 years, 11 months ago

    Dono spelling galat hain

    2Thank You

    ANSWER

    • Posted by Fathima Feby 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Tanushri Jhod 6 years, 11 months ago

    Physics paper is on 18th

    0Thank You

    Yo Yo Honey Singh ? 6 years, 11 months ago

    What is sahodaya question paper I even don't know about it then how can I help you

    0Thank You

    ANSWER

    • Posted by Pooja Yadav 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Tanushri Jhod 6 years, 11 months ago

    First you have to write all the given values then think about the formula nd must remem. The conversion ... Then calculation ... Nd remem. The unit also

    0Thank You

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