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

the surface integral of electric field is called electric field that is the number of electric line of field passing through normally to the surface is called electric flux by mathematically the dot product of electric field and surface area is called electric flux

1Thank You

Shiva Tiwari 7 years ago

The total no of magnetic field lines passing through the closed surface normally . It is denoted by phi suffix me B . Its SI unit is WEBER

2Thank You

Rohit Singh 7 years ago

The total no. of magnetic field lines passing through a unit area is called magnetic flux.

3Thank You

ANSWER

Derivie the eqution for common potential

Posted by Jagmohan Singh 7 years ago

CBSE > Class 12 > Physics

1 answers

Sambhav Sabharwal 7 years ago

see ncert

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ANSWER

Why focal length is always negative in concave mirror?

Posted by Adesh Chahar 7 years ago

CBSE > Class 12 > Physics

4 answers

Muskan Verma 7 years ago

Focal length is always negetive in concave mirror because reflection process takes place on smooth surface and its smooth surface lies on left side therefore all parameters like f n u are taken as negative

0Thank You

Abhineet Aanand 7 years ago

It's acc to sign convention

0Thank You

M. पी. Rai 7 years ago

Inconcave mirror always focal length is zero because it's image form left side

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Manvi Dhariyal 7 years ago

Focal length is always positive for concave mirror. It is negative for convex mirror.

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ANSWER

why emf is greater than internal resistance?

Posted by Siva Dasan 7 years ago

CBSE > Class 12 > Physics

1 answers

Vinayak Raghuvanshi 7 years ago

becacuse emf is a type of potential difference which make the charge to flow

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ANSWER

Bhor magnetron ?

Posted by Devashish Sharma 7 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How to solve kq4e/x2=kqe/a-x2

Posted by Roshni Singh 7 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Distinguish between the magnetic property of Dia fero paramagnetic substance in term of (1)suceptiblity (2)permablity (3)coercivity

Posted by Himanshu Yadav 7 years ago

CBSE > Class 12 > Physics

1 answers

Manvik Malhotra 7 years ago

Read pradeep book surely you get answer?

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ANSWER

Should resistance can be negative?

Posted by Siva Dasan 7 years ago

CBSE > Class 12 > Physics

2 answers

Siva Dasan 7 years ago

Why

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Manan Bedi 7 years ago

3Thank You

ANSWER

Should resistivity can be negative?

Posted by Siva Dasan 7 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

should potential difference can be -ve?

Posted by Siva Dasan 7 years ago

CBSE > Class 12 > Physics

2 answers

Mohit Sepat 7 years ago

In which condition it is negative

0Thank You

Ishita Gupta 7 years ago

Yes

1Thank You

ANSWER

How to solve (R2R3) +R1?

Posted by Siva Dasan 7 years ago

CBSE > Class 12 > Physics

1 answers

Manvik Malhotra 7 years ago

Try yourself again it so easy if you cannot we will help

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ANSWER

In parallel connection V1, V2 is not taken, but in series V1, V2 is taken. Why is it so?

Posted by Siva Dasan 7 years ago

CBSE > Class 12 > Physics

1 answers

Manan Bedi 7 years ago

Because in parallel combination V is constant whereas in series,V is not constant

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ANSWER

ExplAin the drift velocity.?

Posted by Monťý Harsh 7 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

Rohit Singh 7 years ago

It is the average velicity of an electron when it drift toward the +ve terminal of battery under the applied external field.

1Thank You

Kundan Singh 7 years ago

Drift velocity is the average velocity gain by free electrons.

0Thank You

Shubham Thakur 7 years ago

Drift velocity is that average velocity with which free electrons of the conductor drifted from one end to other end.

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ANSWER

A source of AC circuit contains inductance 20mH a capacitance 100 microfarad a resistance 50 ohm an AC source of 12 V , 50 Hz. Find the energy dissipated in the circuit In 1000 sec

Posted by Tannu Yadav 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Vaibhav Gaur 7 years, 1 month ago

3Thank You

ANSWER

The resistivity of copper is 1.7×10-8 ohm and that of aluminium is 2.7×10-8 ohm which material is preferred to use for transmission of electric power and why ?

Posted by Thejaswini Chirnalli Mattad 5 years, 5 months ago

CBSE > Class 12 > Physics

3 answers

Thejaswini Chirnalli Mattad 7 years ago

Please send answer for question and it is three mark question

0Thank You

Thejaswini Chirnalli Mattad 7 years ago

I want this answer for 3 marks question

0Thank You

Vijay Dwivedi 7 years, 1 month ago

Copper because less resistivity means less resistance can flow more current in constant voltage

1Thank You

ANSWER

Will there be any current induced in the coil shown in fig

Posted by Nitin Tomar 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Riya Gupta 7 years, 1 month ago

Where is the figure

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ANSWER

Why the surface of moving coil galvanometer is cylindrical

Posted by Swarnava Ghosh 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Vijay Dwivedi 7 years, 1 month ago

To give the radial magnetic field

1Thank You

ANSWER

How we can score good marks in phys and in its numerical specially

Posted by Manjot Gill 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Shivanshu Pal 7 years, 1 month ago

By practising more and more.

1Thank You

ANSWER

Which one of the two , an ammeter or a miliammeter , has higher resistance and why ??

Posted by Neha Yadav 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Harshrajsinh Zala 7 years ago

Its ammeter

0Thank You

Divyanshu Sahu 7 years, 1 month ago

Offcourse miliameter yar........

2Thank You

ANSWER

Why a rest charge does not experience any force.

Posted by Shivam Rai 5 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Manan Bedi 7 years ago

Bcz a rest charge has no velocity and force=qvb

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ANSWER

Concept of paeallel and series combination

Posted by Chandan Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Aayush Kumar 7 years, 1 month ago

These combinations allows us to generate the accurate values of resistance , capacitance etc. , which can not be obtained by just a single circuit element , such as resistor, capacitor etc.

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ANSWER

calculate the electric field due to an electric dipole of long 10cm constitute of charge of 100 columb at a point 20cm away from the charge ?

Posted by Amania Rilo 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Saurabh Kumar 7 years, 1 month ago

277890000000000000NperC

3Thank You

ANSWER

How to Study at Night (if feeling sleepy)??????

Posted by Nitish Sharma 7 years, 1 month ago

CBSE > Class 12 > Physics

5 answers

Nitish Sharma 7 years, 1 month ago

THANK YOU GUYS I APPERICIATE ALL YOUR ADVICES☺️☺️????????

1Thank You

G K 7 years, 1 month ago

When u feel sleepy...??... then do something which u like or feel happy...?....for ex.- if u like dance then start dancing....u can also read some short stories books....u can also hear music.....OR IT'S NOT IMPORTANT KI FULL NIGHT PADHNA HI JRURI H. ...when u feel sleepy go to sleep and sleep atleast 6-7 hrs.......then wake up in early morning ?...and start studying......AND IF U ALSO FEEL SLEEPY IN MORNING TO BHAII YE TO CHINTA KA VISAY H.....

2Thank You

Eshaan Gupta 7 years, 1 month ago

Watch a movitational video...

2Thank You

Md Tauseef Khan 7 years, 1 month ago

Think about your future

1Thank You

Anjana Sherawat 7 years, 1 month ago

Think about your goal

6Thank You

ANSWER

If a chid fails in first attempt of class 10 compartment can get admission in class 11

Posted by Satyam Tiwari 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Manhar Singh 7 years, 1 month ago

1Thank You

ANSWER

An alternating voltage given by V=110 sin314t is connected across a pure resistance of 50 Ω, Find the frequency of the source and rms current through the resistance.

Posted by Jagriti Shrey 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

H!Mαη$Hμ Ұαδαυ ✔️ 7 years, 1 month ago

It is easy .... Omega =314 rad/s..... _f=314/2π _f=314/2*3.14 _f=50 Hz........ ........and I rms =V rms /R... I rms =110/50 ... I rms=11/5.... I rms=2.2 A

1Thank You

ANSWER

Two charges ,of 5nC and -2 nC ,are placed at point (5 cm,0,0) and (23 cm,0,0)in a region of space where ,there is no other field .Calculate the electrostatic potential energy of this charge system.

Posted by Ashu Tosh 7 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

Nitish Sharma 7 years, 1 month ago

0.5 x10-7

0Thank You

G K 7 years, 1 month ago

Camera ka option bhi hona chahiya tha.....so that I can send u my solution....?

1Thank You

G K 7 years, 1 month ago

-5×10^-7 J.....or simply 0.5microJ.....

0Thank You

ANSWER

Parallel plato capacity

Posted by Akhilesh Yadav 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

G K 7 years, 1 month ago

Parallel Plate Capacitors are the type of capacitors which are formed by arrangement of electrodes and insulating material (dielectric) The two conducting plates act as electrodes which are separated by a dielectric between them. The two plates of parallel plate capacitor are of equal dimensions and is connected to power supply. The plate which is connected to positive terminal of battery acquires positive charge while the plate which is connected to negative terminal of battery acquires negative charge. Due to the attraction charges store between the plates

2Thank You

G K 7 years, 1 month ago

U mean......parallel plate capacitor.....

0Thank You

ANSWER

What is laser

Posted by Neha Kumari 7 years, 1 month ago

CBSE > Class 12 > Physics