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What is velocity selector and its formula?

Posted by Nikku Prajapat 6 years, 9 months ago

1 answers

Sanskriti S 6 years, 9 months ago

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 6 years, 9 months ago

CBSE > Class 12 > Physics

2 answers

Sanskriti S 6 years, 9 months ago

all ncert que 'r imp

1Thank You

Nilesh Kumar 6 years, 9 months 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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ANSWER

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 6 years, 9 months ago

CBSE > Class 12 > Physics

2 answers

Sanskriti S 6 years, 9 months ago

yeah, but optics is of most weightage

1Thank You

Vedika Bisht 6 years, 9 months ago

From part I of ur phys textbook

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ANSWER

Kirch off law numerical aayega is bar

Posted by Abid Ansari 6 years, 9 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

DISPLACE MENT CURRENT

Posted by Naveen Pal 5 years, 8 months ago

CBSE > Class 12 > Physics

3 answers

Suhani Rana? 6 years, 9 months ago

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

0Thank You

Sanskriti S 6 years, 9 months 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 6 years, 9 months ago

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

Posted by Ankit Panwar 6 years, 9 months ago

CBSE > Class 12 > Physics

4 answers

Sanskriti S 6 years, 9 months ago

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

0Thank You

Saurabh Tripathi 6 years, 9 months ago

optics 17 nmbr ka h

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Nilesh Kumar 6 years, 9 months ago

Curren and electricity chapter.

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Abid Ansari 6 years, 9 months ago

Transformer and cylotron 100 percent

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Can a body hold a charge 2 ×10-¹9

Posted by Brajraj Chouhan 6 years, 9 months ago

CBSE > Class 12 > Physics

2 answers

Nilesh Kumar 6 years, 9 months 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 6 years, 9 months ago

Yes.

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ANSWER

Principle construction and working of van de graff generator

Posted by Rohan Yadav 6 years, 9 months ago

CBSE > Class 12 > Physics

3 answers

Shivam Keshri 6 years, 9 months ago

Not in syllabus bro

0Thank You

Bindu Sekar 6 years, 9 months ago

Its works on the basis of electostatic induction.

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Dharshika As 6 years, 9 months ago

it not there for cbse boards 2018-19

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Most mportant topics in physics????

Posted by Nishat Shabnam 6 years, 9 months ago

CBSE > Class 12 > Physics

1 answers

Nilesh Kumar 6 years, 9 months ago

OPTICS AND CURE2NT AND ELECTRICITY.

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ANSWER

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 6 years, 9 months ago

CBSE > Class 12 > Physics

1 answers

Sanskriti S 6 years, 9 months ago

ncert topic 4.9

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Is heating effects of current in syllabus?

Posted by ....... ........ 6 years, 9 months ago

CBSE > Class 12 > Physics

1 answers

Nilesh Kumar 6 years, 9 months 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 6 years, 9 months ago

CBSE > Class 12 > Physics

1 answers

Nivetha Vijayakumar 6 years, 9 months 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 6 years, 9 months ago

CBSE > Class 12 > Physics

1 answers

Sanskriti S 6 years, 9 months 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 6 years, 9 months ago

CBSE > Class 12 > Physics

2 answers

Jagjot Kaur 6 years, 7 months ago

Can you please explain the answer

0Thank You

Brajraj Chouhan 6 years, 9 months ago

Through induction

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

Posted by Sangitaben Patel 6 years, 9 months ago

CBSE > Class 12 > Physics

1 answers

Aayushi Mishra 6 years, 9 months ago

Yes both the topics are there in syllabus.

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ANSWER

Define Ac current ?

Posted by Anupam Kumari 6 years, 9 months ago

CBSE > Class 12 > Physics

1 answers

Harsha Phansalkar 6 years, 9 months 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 6 years, 9 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Torque on a magnetic dipole in a uniform magnetic field

Posted by Jahangir Siddiqui 6 years, 9 months ago

CBSE > Class 12 > Physics

1 answers

Harsha Phansalkar 6 years, 9 months ago

m.B = mBsin∆

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ANSWER

Principal comstruction working of transformer

Posted by Chandan Yadav 6 years, 9 months ago

CBSE > Class 12 > Physics

2 answers

Harsha Phansalkar 6 years, 9 months ago

It works on the principal of mutual induction

0Thank You

Ravi Yadav 6 years, 9 months ago

Mutual induction

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Is npn or pnp transistor more important?

Posted by Sandra Suresh 6 years, 9 months ago

CBSE > Class 12 > Physics

3 answers

Pp Shukla 6 years, 9 months ago

yaa

1Thank You

Puneet Bisht 6 years, 9 months ago

npn

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Dev Pratap Singh 6 years, 9 months 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? 6 years, 9 months ago

CBSE > Class 12 > Physics

1 answers

Sanskriti S 6 years, 9 months 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 6 years, 9 months ago

CBSE > Class 12 > Physics

1 answers

Sanskriti S 6 years, 9 months 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, 8 months ago

CBSE > Class 12 > Physics