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What is velocity selector and its formula?

Posted by Nikku Prajapat 7 years ago

1 answers

arrangement of cross E. F. nd M. F. in a region which helps to select charged particles of given velocity from a beam, irrespective of their charge nd mass. velocity and s given by v=E/B

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How i prepare optics? Suggest some imp. Questions.

Posted by Gurwinder Gill 7 years ago

CBSE > Class 12 > Physics

2 answers

Sanskriti S 7 years ago

all ncert que 'r imp

1Thank You

Nilesh Kumar 7 years ago

The whole topic is based on formula but you have to learn it. Optics is easy because theory is very less in this part.

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I prepared well for exam but can anyone suggest from which part the examiner put most of the question in question paper.

Posted by Nilesh Kumar 7 years ago

CBSE > Class 12 > Physics

2 answers

Sanskriti S 7 years ago

yeah, but optics is of most weightage

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Vedika Bisht 7 years ago

From part I of ur phys textbook

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Kirch off law numerical aayega is bar

Posted by Abid Ansari 7 years ago

CBSE > Class 12 > Physics

0 answers

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DISPLACE MENT CURRENT

Posted by Naveen Pal 5 years, 10 months ago

CBSE > Class 12 > Physics

3 answers

Suhani Rana? 7 years ago

The current which come into play in a region where electric field and electtic flux changes with time

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Sanskriti S 7 years ago

the current which flows in a region where E. F. (nd hence electric flux) us changing with time

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Abid Ansari 7 years ago

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What are the important topics by reading which we can get 40-45 marks

Posted by Ankit Panwar 7 years ago

CBSE > Class 12 > Physics

4 answers

Sanskriti S 7 years ago

optics 25 marks ka h saurabh, see the syllabus in this app

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Saurabh Tripathi 7 years ago

optics 17 nmbr ka h

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Nilesh Kumar 7 years ago

Curren and electricity chapter.

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Abid Ansari 7 years ago

Transformer and cylotron 100 percent

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Can a body hold a charge 2 ×10-¹9

Posted by Brajraj Chouhan 7 years ago

CBSE > Class 12 > Physics

2 answers

Nilesh Kumar 7 years ago

No! Because Q=ne. And from this formula we can put the value and check the 'n' should be integer like 1,2,3.... I hope you will get your answer.

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Nilesh Kumar 7 years ago

Yes.

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Principle construction and working of van de graff generator

Posted by Rohan Yadav 7 years ago

CBSE > Class 12 > Physics

3 answers

Shivam Keshri 7 years ago

Not in syllabus bro

0Thank You

Bindu Sekar 7 years ago

Its works on the basis of electostatic induction.

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Dharshika As 7 years ago

it not there for cbse boards 2018-19

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Most mportant topics in physics????

Posted by Nishat Shabnam 7 years ago

CBSE > Class 12 > Physics

1 answers

Nilesh Kumar 7 years ago

OPTICS AND CURE2NT AND ELECTRICITY.

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derive an expression for the force per unit length between two long parallel wires carrying current also define one ampere

Posted by Krishna Kant Sahu 7 years ago

CBSE > Class 12 > Physics

1 answers

Sanskriti S 7 years ago

ncert topic 4.9

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Is heating effects of current in syllabus?

Posted by ....... ........ 7 years ago

CBSE > Class 12 > Physics

1 answers

Nilesh Kumar 7 years ago

Yes! But not important on behalf of board exam.

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Depict the orientation of the dipole in stable and unstable equilibrium in a uniform electric field

Posted by Sourabh Prajapati 7 years ago

CBSE > Class 12 > Physics

1 answers

Nivetha Vijayakumar 7 years ago

If suppose the electric field is from left to right & the +ve end of the dipole is towards right side & the -ve end points towards left side then it is stable equilibrium. The vice versa is unstable equilibrium

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If a 10 m long metallic bar moves in a direction at right angle to a magnetic field with a speed of 5.0m/s,25v emf is induced in it. Find the value of magnetic field intensity?

Posted by Inikita Kumari 7 years ago

CBSE > Class 12 > Physics

1 answers

Sanskriti S 7 years ago

induced emf, e=Blv => B=e/lv= 25/(10*5)=0.5T

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How will you charge 2 metallic spheres without conduction

Posted by Jagjot Kaur 7 years ago

CBSE > Class 12 > Physics

2 answers

Jagjot Kaur 6 years, 10 months ago

Can you please explain the answer

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Brajraj Chouhan 7 years ago

Through induction

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Are motion in a magnetic field and velocity selector there in syllabus?

Posted by Sangitaben Patel 7 years ago

CBSE > Class 12 > Physics

1 answers

Aayushi Mishra 7 years ago

Yes both the topics are there in syllabus.

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Define Ac current ?

Posted by Anupam Kumari 7 years ago

CBSE > Class 12 > Physics

1 answers

Harsha Phansalkar 7 years ago

The current in which magnitude changes continously and direction changes periodicaly is known as AC current The current in which magnitide and direction remains constant witg respect to time is known as DC current

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The circuit arrangement given below shows that when an passes through the coil A the current starts

Posted by Khushu Kumari 7 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Torque on a magnetic dipole in a uniform magnetic field

Posted by Jahangir Siddiqui 7 years ago

CBSE > Class 12 > Physics

1 answers

Harsha Phansalkar 7 years ago

m.B = mBsin∆

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Principal comstruction working of transformer

Posted by Chandan Yadav 7 years ago

CBSE > Class 12 > Physics

2 answers

Harsha Phansalkar 7 years ago

It works on the principal of mutual induction

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Ravi Yadav 7 years ago

Mutual induction

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Is npn or pnp transistor more important?

Posted by Sandra Suresh 7 years ago

CBSE > Class 12 > Physics

3 answers

Pp Shukla 7 years ago

yaa

1Thank You

Puneet Bisht 7 years ago

npn

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Dev Pratap Singh 7 years ago

Yes

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A current of 5A is flowing through a 10 turn circular coil of radius 7 cm. The coil lies in x-y plane. What is magnitude and direction of magnetic dipole moment associated with it? If this coil were to be placed in a uniform external magnetic field directed along x-axis in which plane would the coil lie,when in equilibrium???

Posted by Suhani Rana? 7 years ago

CBSE > Class 12 > Physics

1 answers

Sanskriti S 7 years ago

mag. of mag. dipole mom. =NIA=10*5*(3.14*0.07*0.07) ; direction along +ve or - ve z-axis. In eqlbm. it is in y-z plane.

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Write the basic features of photon picture of electromagnetic radiation.on which einstein's photoelectric equation is based.

Posted by Balendro Velina 7 years ago

CBSE > Class 12 > Physics

1 answers

Sanskriti S 7 years ago

one quantum of light radiation(tiny packets of energy) is k/n as photon, whuch travel with speed of light. Einstein assumed that one photoe- is ejected from metal surface when photon of suitable energy falls on it. Energy of photon is given by E=hv

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How to prepare for physics exam in 2 days

Posted by Rahul Sheokand 5 years, 10 months ago

CBSE > Class 12 > Physics