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    • Posted by Jaskirat Singh 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 0 answers
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    • Posted by A Kay 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Moksh Sharma 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 3 answers

    Papay Kumari 7 years, 2 months ago

    Total internal reflection= when the source of light placed in a medium and it pass from a point and then it return in a same medium and it is greater then the critical angle.

    1Thank You

    Hy Shona 7 years, 2 months ago

    When a ray of light travelling in a medium incident at the interface at the angla more than crirtical angle than total reflection takes place. i.e not a little amount of light is refracted but 100%reflection takes place.

    1Thank You

    Yogita Ingle 7 years, 2 months ago

    Consider the following situation. A ray of light passes from a medium of water to that of air. Obviously, the light ray will be refracted at the junction separating the two media. Since it passes from a medium of a higher refractive index to that having a lower refractive index, the refracted light ray bends away from the normal. At a specific angle of incidence , the incident ray of light is refracted in such a way that it passes along the surface of the water.

    This particular angle of incidence is called the critical angle. Here the angle of refraction is 90 degrees. So how is the critical angle related to total internal reflection? Any light rays with angles of incidence greater than the critical angle will not cross the water medium at all, will they? They will be “reflected” back into the same medium. This is Total Internal Reflection.

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    • Posted by Nitin Tiwari 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 0 answers
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    • Posted by Yuvaraj Singh Thakur 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Nishant Sharma 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Chinmay Pal Singh 7 years, 2 months ago

    As we know that, E = kl where, l is the length of potentiometer wire, and, k is potential gradient, Acc. to question, E1 = kl1 =>. E1 = k250; E2 = kl2. =>. E2 = k400; =>. E1/E2 = kl1/kl2 =>. E1/E2 = k250/k400; =>. E1/E2 = 250/400. ---answer

    3Thank You

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    • Posted by Adiba Feroj 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 0 answers
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    • Posted by Ayushi Singh 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Hy Shona 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 3 answers

    Hy Shona 7 years, 2 months ago

    Thanks ayush bhai

    1Thank You

    Aditya Roy 7 years, 2 months ago

    Yes...!but in this case the amount of water is high as comparitive level so if we pass electricty in sea water the intensity of current decreases at minimum excent and there ill be a lowest effect of current in it and we can't get affected through it..! Hope that will help u ..!

    1Thank You

    G K 7 years, 2 months ago

    Haha.? Nothing will happen.... Swati.....

    0Thank You

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    • Posted by Kriti Mishra 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Jaggi Bhullar 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Neha Yadav 7 years, 2 months ago

    A vande graff generator is an electrostatic generator which uses a moving belt to accumulate electric charge on a hollow metal globe on the top of an insulated column , creating very high electric potentials .

    4Thank You

    Ankur Kumar Kumar 7 years, 2 months ago

    Nn

    0Thank You

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    • Posted by Ashish Nagar 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    G K 7 years, 2 months ago

    ?Q=CV?...... In case of DC the voltage is constant,.... giving a charge that is constant with time..... Since current is described as the time derivative of charge..... ,therefore DC cannot flow through the capacitor.....

    4Thank You

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    • Posted by Reda Sujen 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 0 answers
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    • Posted by Amit Kumar 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 0 answers
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    • Posted by Somil Singh 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Hy Shona 7 years, 2 months ago

    I hope my answer is satisfied.

    0Thank You

    Hy Shona 7 years, 2 months ago

    Diamagnetic substances -these are the substances which when placed in a strong magnetic field acquire a feeble magnetism oppposite to the direction of magnetic field. e.g-copper,gold,alcohol,water,hydrogen. Paramagnetic substances-they acquire feeble magnetism in the same direction of applied magnetuc field.e.g.platinum, aluminium,air. Ferromagnetic substances-they are strongly magnetised by relatively weak magnetising field in the same sense as the magnetusing field.e.g-Co,Ni,iron,and their alloys.

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    • Posted by Kaynat Chhabra 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 3 answers

    Hy Shona 7 years, 2 months ago

    Actually atoms are not made up of charges but it consists charges as a cell cosist cell organelles but we cannot say that they are madeup of them.i hope i am not wrong am I?

    1Thank You

    G K 7 years, 2 months ago

    Not only atoms, koi bhi cheek electrically neutral tbhi honge when they have same no. Of +ve and - ve charges......

    0Thank You

    G K 7 years, 2 months ago

    By definition, an atom is electrically neutral...... and atoms electrically neutral tbhi honge when they have same no. of +ve and - ve charge..... Proton +ve charge, e- - ve charge.......

    2Thank You

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    • Posted by Mohit Yadav 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Rajan Gupta 7 years, 2 months ago

    Two equal and opposite change seperated by a small distance create its electric field is termed as electric dipole . It experiences a torque in uniform external field

    2Thank You

    Ashish Nagar 7 years, 2 months ago

    No it is an arrangement of unlike charges seperated by a small distance

    0Thank You

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    • Posted by Sneha Rathore 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Tarun Singh Yadav 7 years, 2 months ago

    It is an experimental result that emf occurs when there is change in magnetic flux but we don't know why same as we know masses attract each other but don't know why.Still there are many things yet to discover.

    1Thank You

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    • Posted by Jitendra Singh Rawat 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Samriddhi Udaywal 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Abhishek Saini 7 years, 2 months ago

    We know that there are two intputs in NAND gate & in NOT gate only one input. So, if you join the two input, then you will find that NAND gate becomes NOT gate .

    1Thank You

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    • Posted by Amir Suhail 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Samriddhi Udaywal 7 years, 2 months ago

    When it is at rest wrt magnet

    4Thank You

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    • Posted by Ritu Kumari 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Somil Singh 7 years, 2 months ago

    Kya delete Kare topic

    2Thank You

    ANSWER

    • Posted by Yash Shrivastava 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Ashish Nagar 7 years, 2 months ago

    Because waves are the disturbance of particle due to which wave require a material medium for their propagation

    0Thank You

    Sahood Khan 7 years, 2 months ago

    Because wave energy not enough to propagate. So, wave need medium which provide energy to propagate.

    0Thank You

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    • Posted by Somil Singh 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Hy Shona 7 years, 2 months ago

    Kircboff's junction law-at any junction ,the sum of curents enetring the ju ction must be equal to the sum of currents leaving it. Kirchogg's loop law-the algebric sum of changes in potential around any closed loop of a circuit must be zero

    1Thank You

    Amandeep Kumar 7 years, 2 months ago

    Incoming current at a particular point or junction is equal to the outgoing current

    1Thank You

    ANSWER

    • Posted by Manisha Gupta 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Amandeep Kumar 7 years, 2 months ago

    Numerical and derivation

    0Thank You

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    • Posted by Amit Kandari 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Shivam Shukla 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Yogita Ingle 7 years, 2 months ago

    Current sensitivity : is the measure of responsiveness of any instrument to the change of current through it.
    It is defined as ' The deflection produced for a unit current flowing through an instrument (galvanometer)'.

    Current Sensitivity, 
    Sθ =  θ/I = NAB/C

     

    1Thank You

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    • Posted by Shivam Shukla 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Ishika Singh 7 years, 2 months ago

    According to this law magnetic field at any point due to small current element is directly proportional to the current length of the element and sine of angle length element and the position vector of the point and inversely proportional to the square of the distance between point and element.

    0Thank You

    Yogita Ingle 7 years, 2 months ago

    • We already know now that current carrying conductor generates magnetic field around themselves. Biot-Savart law just mathematically states the intensity of this magnetic field at a point.
    • According to the Biot-Savart law, magnetic field dBdue to current element idl, at a point P situated at distancer from the current element idl,is:

    i) directly proportional to the current element idl, ii) directly proportional to the sine of the angle (θ) between current element and r, and iii) inversely proportional to the square of the distance r between current element and the point

    dB∝idl (sinθ)/r2

    dB = (μo/4π)×idl×(sinθ)/r2

    dB = idl × r / r3

    1Thank You

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    • Posted by Shivam Shukla 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Yogita Ingle 7 years, 2 months ago

    A galvanometer is a device (instrument) used for detecting feeble electric voltage, currents in a circuit. It has a coil pivoted (or suspended) between concave pole faces of a strong laminated horse shoe magnet. When an electric current passes through the coil it deflects. Its deflection is noted by attaching a pointer to the coil (or by using a lamp and scale arrangement). The deflection is proportional to the current passed.
    The galvanometer coil has a moderate resistance (about 100 ohms) and the galvanometer itself has a small current carrying capacity (1 mA).

    3Thank You

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    • Posted by Vishwajeet Singh 7 years, 2 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Somil Singh 7 years, 2 months ago

    It is a device used for converting a low alternating voltage to high alternating voltage and vice versa it is based on phenomena of mutual induction

    2Thank You

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