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

When capacitor is connected to the battery then charge accumulated on the plates of capacitor ,this process continue till the potential difference of capacitor become equal to the battery, hence due to this flow of charge galvanometer show momentary deflection . Now id=dQ/dt, flux=E.A = Q/A now d flux/dt = dQ/ €×dt . Hence id = € dflux /dt

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Meter bridge?

Posted by Vaseel Khan 6 years ago

CBSE > Class 12 > Physics

0 answers

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Sir sample paper m se board exam m ata h kya

Posted by Suryansh Verma 6 years ago

CBSE > Class 12 > Physics

1 answers

Tamanna Sharma 6 years ago

??as they are sample may be selected or may be rejected

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For how much marks derivation n numerical will be asked??

Posted by Saurabh Singh 6 years ago

CBSE > Class 12 > Physics

1 answers

Nancy Verma 6 years ago

3 and 5

1Thank You

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What is the formula of force

Posted by Abhishek Chand 6 years ago

CBSE > Class 12 > Physics

4 answers

Apoorva Rao 6 years ago

F=qe

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Nancy Kansal 6 years ago

There are many like for electrostatic force it is charge into electric field but the basic one is mass into acceleration.

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Muskaan Vig 6 years ago

Force =mass×acceleration.

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Saurabh Singh 6 years ago

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In grounding transformer why eddy current not flows into the earth as we know by grounding all extra load is transferred to the earth?

Posted by Tamanna Sharma 6 years ago

CBSE > Class 12 > Physics

1 answers

Tamanna Sharma 6 years ago

But l think there should be any other reason for this

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The expression for electrostatic pressure and energy density in electrostatic is same,is these things are same or not??

Posted by Tamanna Sharma 6 years ago

CBSE > Class 12 > Physics

0 answers

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Why scale for the measuring instrument for AC is non-uniform?

Posted by Tamanna Sharma 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

what is saturated potential

Posted by Abi Abi 6 years ago

CBSE > Class 12 > Physics

1 answers

Tamanna Sharma 6 years ago

Minimum potential require to move the slowest kinetic energetic electron so it can move to the other surface easily.

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If there is no existence of eddy current then faraday's law is acceptable if yes ,how?if no then why?

Posted by Tamanna Sharma 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Weightage of numericals in 2020 board exams of class twelfth

Posted by Monu Thakur 6 years ago

CBSE > Class 12 > Physics

1 answers

Alisha Jajodia 6 years ago

13-15 marks

1Thank You

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Cbse board physics solved paper 2004

Posted by Rakesh Singh 6 years ago

CBSE > Class 12 > Physics

1 answers

Tamanna Sharma 6 years ago

Don't you think that it's very old paper to practice you have to solve latest sample paper based on new pattern and by the way l can not understand what you want to ask is there any mistake in paper or other thing and this paper is also available on "class 12 board solved and sample papers" app

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How can i pass 12th

Posted by Sujit Kumar 6 years ago

CBSE > Class 12 > Physics

2 answers

Monu Thakur 6 years ago

Just select those units in which you have interst by which you will be able to get pass easily

0Thank You

Kunal M 6 years ago

Read NCERT ONLY

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A train moving directly south with a speed of 10ms−1 . If the vertical component of earth’s magnetic field is 0.54G, calculate (a) Induced emf in the rail car axle of length 1.2m. (b) Direction of induced current.

Posted by Mutthireedy Shivani 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

what is saturation current and stopping potential?

Posted by Divya Namda 6 years ago

CBSE > Class 12 > Physics

1 answers

Tamanna Sharma 6 years ago

Saturation current is the part of reverse/leakage current caused by diffusion of minority carriers from neutral to depletion region. Stopping potential is the potential require to stop the highest kinetic electron from one region to another region.

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Difference between frequency and intensity of light

Posted by Rahul Tiwari 6 years ago

CBSE > Class 12 > Physics

1 answers

Tamanna Sharma 6 years ago

Intensity is no. of photons falling on a particular region in time T. Frequency is the no. of wave that passes through a fixed point in time T.

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If i write only question in answer sheet then how much marks i get

Posted by Ankit Singh 6 years ago

CBSE > Class 12 > Physics

5 answers

Apoorva Rao 6 years ago

Kuch bhi nahi milega balki check kerne wale irritate ho jayenge

0Thank You

Prem Thakur 6 years ago

Apko marks ki jagah C likha milega

1Thank You

Tamanna Sharma 6 years ago

I use this funda when l have no idea about the answer, then luckily sometimes it works ????as Ayaan says

1Thank You

Rahul Tiwari 6 years ago

But some can give you half mark

2Thank You

Rahul Tiwari 6 years ago

No marks will you get

1Thank You

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Sample question papers for class 12th

Posted by Ajitha Cg 6 years ago

CBSE > Class 12 > Physics

0 answers

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A ray of light strikes a silvered surface inclined to another one at an angle of of 90° the reflected ray turn through .......° Plz give ans with explanation

Posted by Shaheena Basha 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Electromagnetic spectrum wavelength and frequency series

Posted by Amit Kumar 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Why it is preferred to operate photodiodes in reverse bias?

Posted by ? N.R. 6 years ago

CBSE > Class 12 > Physics

3 answers

Tamanna Sharma 6 years ago

Because in reverse bias it is easier to observe change in current with change in the light intensity

3Thank You

Amit Kumar 6 years ago

Hpp

1Thank You

Tanish Jain 6 years ago

The current in the forward bias is primarily due to major carriers but in reverse bias it is due to the minor carriers. As the fractional change in the reverse current due to the photoeffects is more easily measurable than in the forward bias current. So photodiodes are operated in the reverse bias.

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The half life of AT^215 is 100us . The time taken for the radio activity of a sample of AT^215 to decay to 1/16th of its initial value is

Posted by Sofia Lee 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Find the intensity at a point on screen in young's double slit experiment where the interfering Waves of equal intensity have path difference of first Lambda by 4 and second Lambda by 3

Posted by Ayan Khan 6 years ago

CBSE > Class 12 > Physics

0 answers

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Is finding focal length by displacement method in n class 12 cbse board syllabus?

Posted by Gaurav Rawat 6 years ago

CBSE > Class 12 > Physics

1 answers

Hari Pankaj Jangid 6 years ago

0Thank You

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Motion of charge partical in magnetic field?

Posted by Mohd Faisal 6 years ago

CBSE > Class 12 > Physics

1 answers

Tamanna Sharma 6 years ago

1 parallel to the field then no deflection ,2. Perpendicular to the field then followed the circular trajectory, 3.inclined at any angle then followed the helical path

1Thank You

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Define dipole moment

Posted by Abhay Singh Sankhwar 6 years ago

CBSE > Class 12 > Physics

3 answers

Jyotsna Rai 6 years ago

A dipole moment is a measurement of the separation of two opposite electrical charges. Dipole moments are a vector quantity. The magnitude is equal to the charge multiplied by the distance between the charges and the direction is from negative charge to positive charge:μ = q · r,where μ is the dipole moment, q is the magnitude of the separated charge, and r is the distance between the charges.

1Thank You

Rishi Kumar 6 years ago

It is an pair of equal an opposite charges seperated by a small distance..... It is a vector quantity and its direction if from negative to positive P=q.2a

0Thank You

Mohd Faisal 6 years ago

P=q2a

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What is the phase difference between any two points of a wavefront?

Posted by Ajit Singhazz Baesla 6 years ago

CBSE > Class 12 > Physics

3 answers

Ayan Khan 6 years ago

Zero

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Student Cbse 6 years ago

0Thank You

Ajit Singhazz Baesla 6 years ago

0Thank You

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What are universal gates? How can AND gate be realized using an appropriate combination of NOR gates

Posted by Mini Mathew 6 years ago

CBSE > Class 12 > Physics

3 answers

Shalini Singh 6 years ago

Not in syllabus

1Thank You

Tamanna Sharma 6 years ago

The gate which can express any boolean function without the help any other gate. As NOR gate is a universal gate so its combination can also be resulting as functionality of AND gate.

2Thank You

Meghna Sharma 6 years ago

Acc to me gates are not in our syllabus so why r u asking about it.????

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