CBSE > Class 12 > Physics | CBSE Board | Homework Help

Alternating current is defined as the current that varies like a sine function with time.
The value of current will oscillate between a maximum value and a minimum value.
In case of AC the current is changing its magnitude at every instant of time.

LC oscillations

LC circuit consists of an inductor and a capacitor connected in a series.
Consider a circuit with a capacitor and an inductor, energy taken from the cell and given to capacitor keeps oscillating between L & C.
The oscillations between L and C are referred as LC oscillations.

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I did not got any mistake letter from cbse till yet what is the solution

Posted by Rohit Yadav 6 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

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Calculate the potential at a point p due to a charge of 4×10 C located 9 cm away. Hence obtain the work done 8n bringing a charge of 2×10 c from infinity to the point p.does the answer depend on the path along which the charge is brought?

Posted by Surya Baksh Verma 6 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Define electrostatics current electricity

Posted by Shivam Khushwaha 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Sheeja Menon 6 years, 3 months ago

Study of charges at rest

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What does it mean that ,an incoming wave can be divided into two weaker waves at the boundary between air and water

Posted by Pratishtha Dwivedi 6 years, 3 months ago

CBSE > Class 12 > Physics

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Mujhe physics mein kuch bhi nahin aata par lekin padne ke liye Baitha Hoon interested Lagti H aur usme derivation ke alavan.numerical to kar hi nahi pata

Posted by Dinesh Kumar 6 years, 3 months ago

CBSE > Class 12 > Physics

9 answers

Srishti Choudhary ✍⏳ 6 years, 3 months ago

Yess u r right mamata☺

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꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 3 months ago

Physics ko hard work karke sabhi subject ki tarah banana padega. ...... Varna boards hai...compromise kyu karna... Am I right shrishti??

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Srishti Choudhary ✍⏳ 6 years, 3 months ago

Me also mamta

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Avesh Malik 6 years, 3 months ago

Physics tips class 12

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Arman Sidhu 6 years, 3 months ago

Physics interesting lagti hae jab hum practice kar ke krte hei

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꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 3 months ago

Meri haalat to sabse kharaab he , sari subject me accha score karti hu, par physics ki wajah se picche rah jati hu

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Aman Kumar 6 years, 3 months ago

Its quite normal....physics hai .,..anything can happen with this subject...ab toh suun suun k aadat ho chuki h?

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Ďãřşháñăã Yadav ? ? ? ✊ 6 years, 3 months ago

?? seems quite विचित्र as u find it interesting but u only able to do derivation but meri maano practice kero numerical ki simplest se tough ki terf jao fir aur interest aayega and tum solve bhe ker paoge. ✌️

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Dr.Niraj Kumar 6 years, 3 months ago

Physics interested lagti hai???

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Is some chapters removed from class 12

Posted by Aman Singh 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Srishti Choudhary ✍⏳ 6 years, 3 months ago

From chemistry

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Srishti Choudhary ✍⏳ 6 years, 3 months ago

Solid state and gp 15 removed fm syllabus ☺

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How explain equivalent resistance

Posted by Deepanshu Choudhary 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Shruti ? 6 years, 3 months ago

Equivalent resistance is a different way of indicating 'total' resistance, which we calculate differently for series and parallel circuits.

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Phy is difficult subject

Posted by Kajal Kunwar 6 years, 3 months ago

CBSE > Class 12 > Physics

7 answers

Kajal Kunwar 6 years, 3 months ago

Thanks a lot??

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Kajal Kunwar 6 years, 3 months ago

I try it now i feel something better .??

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Srishti Choudhary ✍⏳ 6 years, 3 months ago

No if u like this toh sb smjh m aa jayega

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Kajal Kunwar 6 years, 3 months ago

ButHow

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Divyanshu Mishra 6 years, 3 months ago

Ya,it is difficult subject for those who don't want to study concept thorrouly and when we understand concepts once it is quite easy and interesting and curious subject and make individual brilliant and improve imagination capacity of mind and gives intelligency.We should learn formulae and from where it is derive.

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Aman Kumar 6 years, 3 months ago

Its not difficult....the only thing is that .... The student should know the concept well and should also know how to apply that concept....then it will be easy ?

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Ďãřşháñăã Yadav ? ? ? ✊ 6 years, 3 months ago

it is an interesting subject if u try to understand it and start imagining.

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Capacitor effect dielectric on conductor.....notes

Posted by Puja Patel 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Aman Kumar 6 years, 3 months ago

Take it from google or from this app? u will get variety of notes there

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How will you compare two unknown resistance using metre bridge

Posted by Aditya Sharma 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Ďãřşháñăã Yadav???✊ 6 years, 3 months ago

by using the formula S=R(100-l)/l knowing l and R, unknown resistance S can be determined.

2Thank You

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Define commutative

Posted by Padma Tsultim 6 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

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Important topics of chapter1 regarding boards

Posted by Deepak Kumar 6 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

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How we can justify kirchhoff's first and second rule?

Posted by Anubhuti Khatri 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 3 months ago

Kirchhoff’s first rule: In any electrical network, the algebraic sum of currents meeting at a junction is always zero.
Kirchhoff’s second rule: The algebraic sum of changes in potential around any closed loop involving resistors and cells in the loop is zero.

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Why direction of electric field is taken outward(away) for a positive charge and inward(toward) for a negative charge

Posted by Khushi Bhattad 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Aman Pandey 6 years, 3 months ago

Because positive charges have tendency to loss free electrons and hence the field created outside the positive charge.

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Nishu Sahu 6 years, 3 months ago

Because electric field lines are drawn by taking a positive charge near the charge whose electric field should be determined. So when a positive charge is taken near positive charge then it repel the charge ,therefore it is outward. In case negative charge attract positive charge so it is inward.

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If length of wire is doubled then it's resistance become how much??

Posted by Akanksha Kumari? 6 years, 3 months ago

CBSE > Class 12 > Physics

7 answers

Aman Kumar 6 years, 3 months ago

Resistance will be 4 times because as the length gets double(2 l ) , area will becomes half(A/2) then send the downward 2 to upward , u will get 4 times the original one......Hope this help

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Divyanshu Mishra 6 years, 3 months ago

Resistance becomes double because RESISTANCE is directly proportional to Length. Here the length is double not diameter which is diameter of thickness doubled

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Swati Singh 6 years, 3 months ago

Resistance becomes double!

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Ujjwal Kumar 6 years, 3 months ago

1/4times

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Nishu Sahu 6 years, 3 months ago

Length is double then resistance become double.

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Arihant Jain 6 years, 3 months ago

Resistance become double because resistance is directly proprotional to length of a given wire...

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Sia ? 6 years, 3 months ago

Because the thickness of a wire is usually represented by its diameter. Thus when the diameter of a wire is doubled (made 2 times), its resistance becomes one-fourth (1/4).

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Two cohhrent source placed at 3 lamda distance on horizontal plane and emmit wave of wavelength lambda a detectur rotate in a circular path around the cohhrent source. find out number of maximum detect in one rotation

Posted by Jatin Kasaudhan 6 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

A standard cell of 1.0185V ,when used in a one metre long slide-wire potentiometer , balance at 60cm .calculate the percentage erorr in a volmeter balance at 65cm. When reading is 1.1V .

Posted by Roshan Kumar Thakur 6 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

When an inductor is connected to a 200V dc voltage, a current of 1A flows through it. When the same inductor is connected to a 200V, 50 hz ac source,only 0.5 A current flows, explain why? Also,calculate the self inductance of the inductor.

Posted by Amit Kumar 6 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

State ohms law

Posted by Vikash Raj Singh 6 years, 3 months ago

CBSE > Class 12 > Physics

3 answers

Padma Tsultim 6 years, 3 months ago

In simple words the current is directly proportional to potential difference through it.

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Akanksha Kumari? 6 years, 3 months ago

IR = V Where I is current flowing through conductor, R= resistance which is taken constant and V= potential difference across the ends. This at constant temperature

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Aman Kumar 6 years, 3 months ago

At constant temperature, the current flowing through the conductor is directly proportional to the potential difference across the ends of the conductor....

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A double convex lens of focal length 20 cm is immersed full in water of refractive index 4/3 .what will be the change in focal length

Posted by Niveditha Vinod 6 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is the oersted's experiment

Posted by Himanshu Arya 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Himanshu Arya 6 years, 3 months ago

Thank you bro

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Aman Kumar 6 years, 3 months ago

Experiment to Demonstrate the Magnetic Effect of Current First of all make a simple electrical circuit by joining a long straight wire with a battery and a plug. Now, take a magnetic compass needle and place the straight wire parallel to and over the compass needle. Then switch on the circuit so that current flows through the wire from south to north directions. Now, you will found that the north pole of compass needle gets deflected towards the west. But, if the direction of current in the wire is reversed then the north pole of the compass needle gets deflected towards the east. The direction of deflection of magnetic needle can be easily determined by SNOW rule. According to SNOW rule, when current flows through a conductor from South to North direction and the wire is held over magnetic needle then the north pole of the magnetic needle deflects towards west.

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What is Heat produce by resister

Posted by Abhijeet Singh 6 years, 3 months ago

CBSE > Class 12 > Physics