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

You can make the whole sphere to gain a net charge but you can bring a negatively charged object near the sphere which will repel negative charges of sphere and the part near the negatively charged object will become positively charged by induction. unless the electrons on opposite side find a way to escape the sphere as a whole will be electrically neutral.

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The tyres of buses, trucks and aeroplane are made of special rubber material which is slightly conducting. Why

Posted by Amit Verma 7 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Keshav Rana 7 years, 4 months ago

Charge may get high due to friction between tyres and the air strip. If the tyres made slightly conducting, they will lose charge to the earth otherwise may produce spark nd result in fire

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Vehicles carrying inflammable materials usually have metallic chains touching the ground during the motion of the vehicle. Why

Posted by Amit Verma 7 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Keshav Rana 7 years, 4 months ago

Moving vehicles get charged due to friction. The inflammable material may catch fire due to spark. But when mettalic rope is used, the charge develop on the vehicle is transferred to the ground so the fire is prevented.

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Force of attraction b/w two point charges placed at a distance (d) is F. What distance apart should they be kept in the same medium so that the force b/w them is 2F

Posted by Dheeraj Tiwari 7 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

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Why ideal dipole should have negligible distance of separation ?

Posted by Abhinav Kalaliya 7 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Find the electric field at C

Posted by Jyoti Raut 7 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Am an bio student so i not able to understand integration used in physics and chemistry can anyone help me plz

Posted by Yuvraj Singh 7 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Vikitha M 7 years, 4 months ago

Thanks

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Rishabh Sahu 7 years, 4 months ago

To understand the methods used Remember all the integration formulae described in class 11 th and 12 th physics ncert Understand and remember all the rules of integration. Understand integration as the summation ie summing up of differential elements dx *f(x) between particular values of x and x+dx such that dx is very small so the change in f(x) between x and x+dx is negligible. This is basic concept of integration on a graph . Whenever we derieve a new result we use this concept . So for example we know the result of a point charge then we can use the point charge as an element(largest entity whose result is known)while deriving the result of a ring considering the ring is made up of point charges and the result of the point charge can be expressed as a function of x f(x) or it depends on the values of x following particular rule or formula . So we are doing the same and adding the thin vertical lines below f(x) vs x graph areas as elements . Similarly while you derieve the result of disk ,you consider elements as rings such that you know the result of a ring. Also being a bio student you are usually told to remember the formulae without understanding the derivation .In that case just remember it as you know the result of a small part ,you want the result of whole entity ,so you add up the useful effects of individual entities that are effective to get net result which you name as integration and use formulae. If you would still like to spend some time to understand the then there are books which are based on maths required for physics. You may download the pdf of halliday resnick and walker physics from archive.org which describes the methods used for derivations using calculus between the chapters. For chemistry usually the derivation are simple and if you understand those used in physics then chemistry ones should be easy for you. You can go to your teachers after or in between classes to explain and understand them in detail.

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A charge particle having charge 2micron/C & mass 10ml g, placed in uniform electric field of 2×10⁴N/C find field. i. Acceleration of charge particle. ii.speed of charge particle after 10sec. iii.distance cover by charge particle in 10sec.

Posted by Pinki Verma 7 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Why do electostatics force of line not form a closed loop

Posted by Suyesh Srivastava 7 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Krishna Verma 7 years, 4 months ago

Electrostatic force of line do not form close loop because these force lines only move from "+ve"to "-ve" not from "-ve" to "+ve".

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Anonymous A 7 years, 4 months ago

Because charge emerge from + ve and terminate at - ve point

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Shamsuddin

Posted by Shamsulslam Shamsulslam 7 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Shamsulslam Shamsulslam 7 years, 4 months ago

Lile

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What change would be required to eletrifiey the sphere of radius 25cm so as to get the. Surface charge density of 3/phai

Posted by Yuvraj Arora 7 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Out of crown and flint glass ,which one has large dispersive power and why

Posted by Preet Sandhu 7 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

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What is the value of dielectric constant for conductors

Posted by Chandranshu Gautam 7 years, 4 months ago

CBSE > Class 12 > Physics

3 answers

Krishna Verma 7 years, 4 months ago

Dielectric constant is inversely proportional to electric field. The Electric field (E) inside a conductor is always zero under the static situation so the dielectric constant for conductor is infinite.

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Krishna Verma 7 years, 4 months ago

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Ajin Sreekumar 7 years, 4 months ago

Infinite

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Readings of ohms law expriment

Posted by Preeti Beniwal 7 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is electric diode

Posted by Manmeet Singh 7 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Aditi Shukla 7 years, 4 months ago

Sir I think 2 members are violating these rules. I that's why request you to please control them.

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Sanket Kumar 7 years, 4 months ago

A system of two equal(magnitude of charge ) and opposite(signs of charge ) charge separated by some distances is called electric dipole. The between two charges is called length of an electric dipole. Denoted by vector 2a.

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What is Triboelectricity

Posted by Adish Jain 7 years, 4 months ago

CBSE > Class 12 > Physics

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What is the relationship between electric field intensity and dipole moment in case of equitorial point?

Posted by Anubhooti Saxena 7 years, 4 months ago

CBSE > Class 12 > Physics

3 answers

Krishna Verma 7 years, 4 months ago

"2l" refers to total distance between these two charges.

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Krishna Verma 7 years, 4 months ago

For Axial E=(2P)/(4πε0×r^3). {P=q×2l} For equitorial E=(P)/(4πε0×r^3).

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Chandranshu Gautam 7 years, 4 months ago

E=(1÷4piE)p/r^3

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What is the net flux ,if a point charge place at corner of the cube

Posted by Suhani Kumari 7 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Rishabh Sahu 7 years, 4 months ago

Let the point charge have charge Q .The cube is a part of 1 out of 8 octants in the 3 d environment with charge Q at origin.. .Then the cube will have all the electric field lines of that octant passing through it . By gauss law we know that flux through all 8 octants ie the whole vicinity is Q/ε . Then each octant will have flux equal to( 1/8)(Q/ε) thus the net flux through the cube is Q/8ε.

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A loadaed 20000 kg wagon is movin on a level at 6 metre per second suddenly 5000 kg of coal is dropped out of the wagon the final speed of wagon is

Posted by Roshan Yadav 7 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Ayush Trivedi 7 years, 4 months ago

Its a tricky one from pd

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Torque on a dipole can be negetive or not?

Posted by Gourav Chawla 7 years, 4 months ago

CBSE > Class 12 > Physics

3 answers

Prasoon Srivastava 7 years, 4 months ago

Yes it could be when the dipole makes an angle of 180° with the electric field.

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Sarvesh Shukla 7 years, 4 months ago

No as it is a scalar quantity of dot products of two vectors.

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Naveen Mokharia 7 years, 4 months ago

No. torque experienced by an electric dipole placed in a uniform electric field can't be zero

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Why charge is not developed on a metal rod held in your hand

Posted by Chesta Jain 7 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Dheeraj Sharma 7 years, 4 months ago

When we hold a metal rod then no charge develop on the metal rod it is because our hand carry neutral charges and if by chance our hand get charged then that charge goes to the ground because our body is a good conductor of electricity

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Rutvi Sharma 7 years, 4 months ago

bcoz our body is also an conductor so the charge produced in the metal rod goes to the ground through our body.

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Alumina send object is placed at a depth be in a denser medium of refractive index new prove that radius R of the base of the cone of flight from the object that can emerge out from the surface is a is equal to be upon under root mean square minus one

Posted by Rajan Chauhan 7 years, 4 months ago

CBSE > Class 12 > Physics