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

Path independence of the line integral of the electrostatic field created by an arbitrary charge distribution. A positive arbitrarily shaped charge distribution. The line integral of the total electric field, generated by the whole distribution, from A to B is independent of the path joining them.

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When air is replaced by a dielectric mendium of dielectric constant k, the force of attraction between two charges q1 and q2 separated by a finite distance 'd ' will be

Posted by Khushboo Walia 4 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Ankit B 4 years, 4 months ago

Force of attraction=Kq1q2 D² where,k =1/4πe.

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Two identical metallic spherical sale A and B having charge + 4 q and minus 10 Q are kept a certain distance apart a third identical uncharged spare see its first placed in contact with spare a and then with Spear B then spare A and B brought in contact and then separated find the charge on the square A and B

Posted by Pranjal Singh 4 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Ashish Kumar 4 years, 4 months ago

+3q

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Gargi Arya 4 years, 4 months ago

The charge on A and B will be -q

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Why microfarad is used as practical units of capcitance of a capacitor instead of farad?

Posted by Manasmita Nayak 4 years, 4 months ago

CBSE > Class 12 > Physics

3 answers

Prachi Agarwal 4 years, 4 months ago

Microfarad vis used as practical units of capacitance of a capacitor instead of farad the radius of farad is greater than the radius of earth i.e. 6400km

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Nik . 4 years, 4 months ago

Ghkot

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Black Panther 4 years, 4 months ago

The capacitor measures very low voltage so it is in microns.

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Didi ye bataye ki standing wave and plane progressive wave kya hoti hai ??

Posted by Ayush Kumar Singh 4 years, 4 months ago

CBSE > Class 12 > Physics

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Derive guess theorm

Posted by Kowshik Deka 4 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

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Which topics of ch 1 are impotant as JEE mains point of view?

Posted by T メ Rex 彡 Krishan 4 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

T メ Rex 彡 Krishan 4 years, 4 months ago

Physica

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Nik . 4 years, 4 months ago

Which subject

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What I can do to achieve 90+ in class 12 non medical 2022

Posted by Riya Rana 4 years, 4 months ago

CBSE > Class 12 > Physics

5 answers

Armaan Ojha 4 years, 4 months ago

You have to work hard

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T メ Rex 彡 Krishan 4 years, 4 months ago

Don't read theory from ncert specially for physics use reference book only do ncert excercise

4Thank You

Lokesh Sahu 4 years, 4 months ago

Hard work and smart work

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Sagar Hansda 4 years, 4 months ago

Just believe in yourself and work hard . Then definitely you will achieve good marks. ?

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Ashish ?? Negi 4 years, 4 months ago

Padai kar ?

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New syllabus for class 12 non medical

Posted by Riya Rana 4 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is binding energy per nucleon?

Posted by Sagar Hansda 4 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Saloni Kaushik 4 years, 4 months ago

(delm c)/A where A is maas number

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A cylinder of radius R and length L is placed in a uniform electric field E parallel to the cylinder axis. The total flux for the surface of the cylinder is given by

Posted by Anchal Shukla 4 years, 4 months ago

CBSE > Class 12 > Physics

3 answers

Ak Kumar 4 years, 4 months ago

Total flux will be zero, because flux through any closed surface is zero.

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Rishita Thakur 4 years, 4 months ago

Zero

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Sia ? 4 years, 4 months ago

{tex}2 \pi R^2 E{/tex}

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What polytechnic does

Posted by Vishvesh Vishvesh 4 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 4 years, 4 months ago

A polytechnic was a tertiary education teaching institution in England, Wales and Northern Ireland offering higher diplomas, undergraduate degree and post graduate education that was governed and administered at the national level by the Council for National Academic Awards.

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If an electron ,moving with a finite velocity, enters a transverse electric field, then which path will the electron be take ?

Posted by Kartika Verma 4 years, 4 months ago

CBSE > Class 12 > Physics

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You are asked to measure e.m.f of a cell.Which instrument will you use? A high resistance Voltmeter or Potentiometer and why?

Posted by Suraj Mishra 4 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Suraj Mishra 4 years, 4 months ago

The Voltmeter basically measures the Potential Difference between two electrodes. ... That's why it is not used to measure the e.m.f. of the cell. Now, Potentiometer measures the e.m.f. of the cell, which is nothing but the open circuit voltage of the cell.

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Which of the following unit cell has all the angles at 90? but the sides are of unequal length?

Posted by Prakhar Raghuvanshi 4 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Anurag Saral 4 years, 4 months ago

orthorhombic

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If a charged body is to retain charge for a long time, it should not have point ends. Why?

Posted by Jashan G 4 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Shikha Singh 4 years, 4 months ago

If you ever have noticed in winters ,our nose , fingers tips are cooler than rest of our body(even being at the same condition) Pointed things relalease out energy or we can say looses energy at higher rate than curved ones

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Use the lens equation to show that an object placed between f and 2f of a convex lens produces a real image beyond 2f

Posted by Adhya Singh 4 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Shraddha ✨✰✰ 4 years, 4 months ago

Since image distance is negative, image is formed at the same side of mirror as the object at a distance greater than 2f. Magnification is given by: m=−vu<0. Hence, theimage formed is real.

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Adi Magotra 4 years, 4 months ago

Hello

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A uniform electric field of strength 2*10^3N/C is established between two parallel plates of length 0.1 m held horizontally at a distance 0.02m apart an electron is projected at a speed of 6*10⁶ m/s making an angle 45°, the field is directed vertically upward.will the electron strike the either plate?If it strikes the plate , where does it do so?

Posted by Hafsa Khatoon 4 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Shikha Singh 4 years, 4 months ago

It will follow parabolic path so consider it as an parabola question and find the range

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Why p type and n type are electrically neutral through holes not through electrons??¿

Posted by Prachi Prachi 4 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Anurag Saral 4 years, 4 months ago

What Google says: p and n type materials are NOT positively and negatively charged. An n-type material by itself has mainly negative charge carriers (electrons) which are able to move freely, but it is still neutral because the fixed donor atoms, having donated electrons, are positive. Similarly p-type material by itself has mainly positive charge carrier (holes) which are able to move relatively freely, but it is still neutral because the fixed acceptor atoms, having accepted electrons, are negative.

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Anurag Saral 4 years, 4 months ago

My Answer: p and n type semiconductor are not actually +vely and -vely charged... as in n type electrons move towards p type due to which the donor atom acquires + and in p type acceptor holes acquire - which makes it neutral.

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Explain "In parallel combination the bulb with highest wattage will glow brighter with maximum brightness and will fused first "

Posted by Kajal Kansal 4 years, 4 months ago

CBSE > Class 12 > Physics

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Sometimes we take charge of electron positive and sometime we take it negative in which case we take it positive and in which case we take it negative?????

Posted by Deepty Kundu 4 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Shikha Singh 4 years, 4 months ago

If are talking about charge of electron then it is always negative.....in some situations the polarity of charge does not matter whether the charge is negative or positive Like while calculating electric force and electric field intensity we only consider the magnitudes of the charges

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Why should we have narrow sources to produce good interference fringes???

Posted by Kirti Sharma? 4 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Shraddha ✨✰✰ 4 years, 4 months ago

: It is because a broad source is equivalent to a large number of narrow sources lying close to each other. Different pairs of narrow sources willproduce their own interferencepatterns which will overlap each other

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Nik . 4 years, 4 months ago

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A rectangular loop and a circular loop are moving out of a uniform magnetic field region with a constant velocity V as shown in the figure in which loop do you expect the induced EMF is constant during the passage out of the field region the field is normal to the loops

Posted by Professor Matemáticas 4 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Professor Matemáticas 4 years, 4 months ago

In this question Rate of change of area of Circular loop is not constant But Rate of change of area of rectangular loop is constant Please Explain Why Rate of change of area of Circular loop is not constant and why rate of change of area of rectangular loop is constant

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No work is done in moving a test charge over an equipotential surface. Why

Posted by Parneet Dhillon 4 years, 4 months ago

CBSE > Class 12 > Physics

3 answers

Saloni Kaushik 4 years, 4 months ago

W=delV ×q and delV=0 as V in an equipotential surface is same

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Nidhi Bharti 4 years, 4 months ago

This is because potential over the equipotential surface is same everywhere and work done is given by the formula: ( Work done = q∆V) and as ∆V is 0 so work done will also be zero

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Manvi Gupta 4 years, 4 months ago

Because potential is same at every point on equipotential surface. W/q=Vb-Va Vb=Va So,W/q=0 W=0

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3.Find The Force Of Attraction Between An Electron & a proton separated by a distance of 1.6 mm?

Posted by Lilly Vaidya 4 years, 4 months ago

CBSE > Class 12 > Physics