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

A thermocouple is made by joining two. dissimilar metals at one end.... The joined end is referred as the HOT JUNCTION..... The other end of these dissimilar metals is referred as the COLD. JUNCTION.....

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G K 7 years, 2 months ago

THERMOCOUPLE : It is an electrical device consisting of two dissimilar electrical conductors forming electrical junctions at differing temp. .....In other words, it is a type of sensor used for measuring the temp. in the form of an electric current or the EMF. ......

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ANSWER

For measuring voltage of any circuit, potentiometer is preferred to voltameter why?

Posted by Hy Shona 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Deepanshu Jaiswal 7 years, 2 months ago

Potentiometer is better device than voltmeter . 1. When voltmeter is fitted it draws certain current for its own operation. Therefore current in the main circuit decrease and hence potential difference gives lesser reading. 2. In potieometer the reading is taken when current is zero hence there is no potential less.

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ANSWER

Potentiometer measures potential moree accurately why?

Posted by Hy Shona 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Deepanshu Jaiswal 7 years, 2 months ago

All ready answer is given by me in above question asked by u

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ANSWER

why is easier to pull a lawn roller than to push it explain

Posted by Rudra Pratap 7 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

G K 7 years, 2 months ago

Its class 11th topic.....

1Thank You

G K 7 years, 2 months ago

It is easier to pull a lawn roller than to push it.....we can explain this using the resolution of forces. ... it is because when we pull/push a lawn mower, we apply a force in the direction of its handle which is at an angle with the ground.... So there is always a component of force normal to the ground.

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ANSWER

Why frequency does not change with medium??.....while velocity and wavelength changes.....

Posted by G K 7 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Rishabh Payel 7 years, 2 months ago

Its not exact answer....

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Arslaan Panwar 7 years, 2 months ago

Frequency doesn't change because it depends on travelling of waves across the interface. But speed and wavelength change as the material on the other side may be different, so now it might have a longer/shorter size of wave and so the number of waves per unit time changes.

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ANSWER

A series LCR circuit

Posted by Sumit Rai 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Aryan Rajpoot 7 years, 2 months ago

It contains L, C, R in series

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ANSWER

Define Q factor of RMS circuit

Posted by Umrah Arshad 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Hy Shona 7 years, 2 months ago

The sharpness of tuning at resonance is measured by Q-factor or quality factor of the circuit.

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ANSWER

If f is the magnitude a force experienced by a unit charge placed at a distance of one centimetrefrom an infinitely large charge sheet then what will be the force experienced by the same charge placed at a distance of 2 cm from the same sheet

Posted by Tannu Sharma 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Hy Shona 7 years, 2 months ago

It remains same because for a plane charge sheet force depend on sima,charge and area. F=qE F=q×sigma/esinnot Because for a plane sheet E=sigma/esinnot Therefore,F=q×q/Aesinnot. Because,sigma=q/A Hance F do not depend on the distance of charge.terefoe the value of F do not change with diatance it remains same. I hope my answer is right.

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ANSWER

Obtain an expression for the lateral displacement of the emergent ray.

Posted by Divyanshi Mishra 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How we can easily do our physic numerical plz reply

Posted by Karan Wadhwa 7 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

G K 7 years, 2 months ago

By Practice....as practice makes a man perfect...

0Thank You

Ayush Parija 7 years, 2 months ago

Understand the concepts you can do numericals with ease

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ANSWER

Limitations of ohms law and gauss law

Posted by Shivanshu Rathour 7 years, 2 months ago

CBSE > Class 12 > Physics

4 answers

G K 7 years, 2 months ago

??right

0Thank You

Hy Shona 7 years, 2 months ago

Limitation of gauss law=gauss law is useful only in limited number of situation,where there is a high degree of symmetry such as spherical ,cylindrical etc.

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Mohit Sepat 7 years, 2 months ago

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G K 7 years, 2 months ago

OHMS LAW : This law cannot be applied to unilateral networks..... like diode, transistors, etc., which do not have same voltage current relation for both directions of current...GAUSS LAW : kuch symmetry ka tha abhi yaad ni aa rha...

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ANSWER

Define 1 tesla

Posted by Shivanshu Rathour 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Focal length of a convex lens is always positive or negative...

Posted by Amandeep Kumar 7 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Hy Shona 7 years, 2 months ago

For convex it is always pisitive for mirror as well as for lens

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Aniket Upadhyay 7 years, 2 months ago

Yeah it's always positive according to sign convention

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ANSWER

An ac source generator a voltage v=v°sin wt is connected to a capacito

Posted by Umrah Arshad 7 years, 2 months ago

CBSE > Class 12 > Physics

3 answers

Aryan Rajpoot 7 years, 2 months ago

Then......????

0Thank You

Mohit Sepat 7 years, 2 months ago

Then what is the question.???

0Thank You

Akshat Sharma 5 years, 8 months ago

So what?????????

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ANSWER

Define one tesla using the expression for the magnetic force acting on a particle of charge q moving with velocity v in amagnetic field B

Posted by Aashu Yadav Yadav 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

In physics Ncert is enough or not for board preparation??

Posted by Abhishek Kumar 7 years, 2 months ago

CBSE > Class 12 > Physics

4 answers

Amandeep Kumar 7 years, 2 months ago

No..

1Thank You

Naman Sharma 7 years, 2 months ago

If you want 70 put of 100 then ok but if you want more then it is not sufficient

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Anand Rajput 7 years, 2 months ago

Enough

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Divyansh Rathore 7 years, 2 months ago

Doing ncert +sample or previous year papers sincrely are sufficient

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ANSWER

What is solinoid?

Posted by Abhishek Kumar 7 years, 2 months ago

CBSE > Class 12 > Physics

3 answers

Deepak Jindal 7 years, 2 months ago

It is an endless solenoid..????

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Aniket Upadhyay 7 years, 2 months ago

A soft metal coverd with some conducying wire

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Amandeep Kumar 7 years, 2 months ago

a straight toroid is called solenoid

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ANSWER

What should be the refracting angle of a prism of refractive index 1.5 so that a light ray incidince on the prism at an angle of 50 degree suffers minimum deviation

Posted by Anshika Yadav 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Principal of potentiometer

Posted by Shivanshu Rathour 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 7 years, 2 months ago

Potentiometer is a device used to compare the e.m.f. (electromotive force) of two cells, to measure the internal resistance of a cell, and potential difference across a resistor.
The potentiometer works on the principle that when a constant current flows through a wire of uniform cross sectional area, potential difference between its two points is directly proportional to the length of the wire between the two points.

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why the current in series remain constant

Posted by Ritik Bhati 7 years, 2 months ago

CBSE > Class 12 > Physics