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G K 7 years, 2 months ago

any e- that is not attached to an ion, atom, or molecule and is free to move under the influence of electric or magnetic field.....is called free electron...

ANSWER

The peak value of an alternating emf is 10 v and it's frequency is 50Hz at a time t=1/600 s the instantaneous value of emf is

Posted by Dharani . 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Satyam Kumar 7 years, 2 months ago

Eo=10v. E=Eo.sin.omega.time omega=2πnu Nu=50hz. Put the values we get E=10sinπ1/30.

ANSWER

220 volt is the rms value of ac supply at homes in india . What is peak value

Posted by Kavita Singh 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Satyam Kumar 7 years, 2 months ago

220×√2=311volt peak value

ANSWER

What is daipol moments

Posted by Mintu Pandey 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Prashant Chaudhary 7 years, 2 months ago

Dipole moment is a mesurment of separation of two opposite electrical charges.

ANSWER

What happens to resolving power of telescope if yellow light is replaced by red light?

Posted by Sunanda Naik 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

three identical positive charges of + 4 microcoulomb are placed at the vertices of equilateral triangle of length 10 cm.calculate the force acting at any charge of any corner

Posted by Rahul Kumar 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

If the intensity of incident light is double, then how does the maximum kinetic energy with which photoelectron are emitted changes

Posted by Abhishek Upadhayay 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Anjana Sherawat 7 years, 2 months ago

No effect

ANSWER

Why electron is not use in cyclotron

Posted by Arslaan Panwar 7 years, 2 months ago

CBSE > Class 12 > Physics

4 answers

Hy Shona 7 years, 2 months ago

Satyam i think yogita is also right..

Satyam Kumar 7 years, 2 months ago

Megha you give very correct answer cyclotron only accelerate alpha particle and protons they much mass to accelerate in cyclotron

G K 7 years, 2 months ago

A cyclotron cannot be used to accelerate electrons.... becoz e- are of very small mass... Thus, the velocity increased to such a great extent that the e- will be thrown out of the step with the oscillating field......

Yogita Ingle 7 years, 2 months ago

Electrons cannot be accelerated to high velocities by cyclotrons because the mass of the electron is very small and a small increase in energy of the electron makes the electron move with very high speed. As the velocity of the electron increases, the relativistic mass also increases. As a result of it the electron goes quickly out of step with the oscillating electric field. But in the case of protons or deuteron, the relativistic increase in mass is very small. For example, the mass of a two million volt electron is about five times its rest mass, while the mass of a two million volt deuteron differs from its rest mass by only about 0.01 percent

ANSWER

An alpha particle is travelling at right angles to magnetic field with aspeed of 6×10^5 m/s. The strength of the magnetic field is 0.2 T . Calculate 1-force on the alpha particle 2- acceleration of the alpha particle

Posted by Vishal Toppo 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

A resistor is stretched twice its length ,how does its resistance and specific resistance change

Posted by Mohit Sepat 7 years, 2 months ago

CBSE > Class 12 > Physics

7 answers

Mohit Sepat 7 years, 2 months ago

Thanku

G K 7 years, 2 months ago

Resistance=£L/A.....£= resistivity, L=length, A=area of cross-section......there is no current in this formula...?

G K 7 years, 2 months ago

Its not current mohit....its area of cross -section of wire after it is stretched twice.....

Mohit Sepat 7 years, 2 months ago

Aapne current 0.5A kyu liya

G K 7 years, 2 months ago

Let £ = resistivity , R = resistance , R' = new resistance , A = area , A' = new area , L = length.....wire ko 2 time stretch kiya h, therefore L' = 2L....volume is same in both case.....therefore A×L=A'×L'....A×L=A'×2L....A'=A/2.... R'=£(2L)/0.5A....R'=4£L/A...R'=4R..... £(resistivity) doesn't change as it is property of material.....

Mohit Sepat 7 years, 2 months ago

How u can say this give reason

Anjana Sherawat 7 years, 2 months ago

I think resistance becomes 4 times but resistivity remain unaffected

ANSWER

Out of Ag ,Cu ,Fe and Al which is best conductor

Posted by Mohit Sepat 7 years, 2 months ago

CBSE > Class 12 > Physics

6 answers

Mohit Sepat 7 years, 2 months ago

Conductor of heat and electricity

Amandeep Kumar 7 years, 2 months ago

Conductor of what

Aryan Rajpoot 7 years, 2 months ago

It wasn't again it was Ag ***

Aryan Rajpoot 7 years, 2 months ago

Again because it has higher thermal conductivity

Mohit Sepat 7 years, 2 months ago

Why ag is .....

Anjana Sherawat 7 years, 2 months ago

ANSWER

The element of heater is very hot while the wire carrying are cold .why ....

Posted by Mohit Sepat 7 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Mohit Sepat 7 years, 2 months ago

What is the material that of it made

Anjana Sherawat 7 years, 2 months ago

Because spring used in heater is made of different material and wire is made of different material so they have different thermal or conducting ability

ANSWER

Name the carrier o electric current in 1.bar made of silver . 2 . hydrogen discharge tube . 3.a germanium semiconductor. 4.a wire of alloy nichrome . 5.a superconductor .

Posted by Mohit Sepat 7 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Mohit Sepat 7 years, 2 months ago

In all ,carriers are electron

Anjana Sherawat 7 years, 2 months ago

I think in silver crystal carnels , in semiconductor electrons and holes

ANSWER

A current is passed through a steel wire heated to red .then half of the wire is immersed in cold water .which half of the wire will heat up more and why .???

Posted by Mohit Sepat 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

A heater coil is cut in two parts and only one of them is used in the heater ..what is the ratio of heat produced by this half coil to that by the original coil.??!???

Posted by Mohit Sepat 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Cy9j

Posted by Akanksha Sharma 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

The lengths of 3 conducting wires are in the ratio of 1:2:3 .all the wires are of same metal and their radii are equal .if we join them in parallel across a battery,,,what will be the ratio of current in them.????,???????

Posted by Mohit Sepat 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Mohit Sepat 7 years, 2 months ago

6:4:2

ANSWER

What is the ratio of initial and final resistance,when a metallic wire of length l is stretched to double its length ,assuming no change in density on stretching

Posted by Mohit Sepat 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Mohit Sepat 7 years, 2 months ago

It will become 4 times of original resistance

ANSWER

Van de graff generator is in our syllabus or not???

Posted by Manvik Malhotra 7 years, 2 months ago

CBSE > Class 12 > Physics

4 answers

Navjot Kaur 7 years, 2 months ago

No it has been reduced from syllabus .

Princesses Kaur 7 years, 2 months ago

Yes imp topic

Nitesh Yadav 7 years, 2 months ago

yes it is in our syllabus

Mohit Sepat 7 years, 2 months ago

Not

ANSWER

Is value based questions are deducted from our syllabus in all PCB by board . my cousin inform me .all of you are sure please tell me???

Posted by Manvik Malhotra 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Mohit Sepat 7 years, 2 months ago

Yes they are deleted from syllabus

4Thank You

ANSWER

Explain dire ct current

Posted by Priya Jain 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Yash Raj 7 years, 2 months ago

The current which does not vary with time or remains steady .A unidirectional flow of electron from lower potential to higher potential outside the circuit, constitute a DC

ANSWER

Formula of spherical surface in concave

Posted by Hamza Mughal 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

When a DC source is provided to a LC circuit the current will flow continuously or not.

Posted by Satyam Kumar 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Yagyesh Dubey 7 years, 2 months ago

Dc will flow and ac will blocked

ANSWER

What is new capacitance after inserting the dielectric slab in it

Posted by Satyam Kumar 7 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Yagyesh Dubey 7 years, 2 months ago

Increase by k times

Satyam Kumar 7 years, 2 months ago

In b/w thw plates of capacitor

ANSWER

What is time constant?

Posted by Satyam Kumar 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Yash Raj 7 years, 2 months ago

RC which has the dimension of time is known as time constant ,in RC circuits.

ANSWER

Forward biasing working

Posted by Pallavi Rani 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Pallavi Rani 5 years, 8 months ago

ANSWER

a+b+c=0 prove that a×b=b×c=c×a Note they are vectors

Posted by Arslaan Panwar 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Arslaan Panwar 7 years, 2 months ago

Sorry its maths?

ANSWER

What are constructive and destructive interference?

Posted by Sethu Mani 7 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Shriya Gupta 7 years, 2 months ago

Crest of one fall over the trough of other then it's destructive

Shriya Gupta 7 years, 2 months ago

When crest of one falls over the crest of other or trough of one falls over the trough of other it is constructive interface and when crest and trough of other it is destructive interference