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

It will behave as diamagnetic material .when placed near a bar magnet ,it will feebly magnetise opposite to the direction of magnetising field . So it will repelled away from magnet and the direction will be opposite to the direction of magnetic field of bar magnet.

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How many times the electric force is stronger than magnetic field

Posted by Nigam Jaat 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Mohit Sepat 7 years, 2 months ago

137times

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ANSWER

Define specific resistance. Write its SI unit.

Posted by Aayush Kaushal 7 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Rajat Dhull 7 years, 2 months ago

Reciprocal of conductivity???

1Thank You

Yogita Ingle 7 years, 2 months ago

Specific resistance or resistivity (ρ), of a conductor, is defined as the resistance of a conductor of unit length and unit area of cross-section.
Its SI unit is ohm^-m
Specific resistance or resistivity is the characteristic property of the material of the conductor and depends only on the nature of the material and temperature.

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why doea current in steady state not flow in acapacitor connected acrss a battery ?However ,momentary current flow during charging or discharging of capacitor .Explain?

Posted by Tigerose Yad. 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

?Do electromagnetic waves carry energy and momentum. ❓❔❓❔

Posted by Yo Yo Honey Singh ? 7 years, 2 months ago

CBSE > Class 12 > Physics

3 answers

Deepak Jindal 7 years, 2 months ago

?????

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Amitha Chandran 7 years, 2 months ago

waves, such as sound waves, can not travel through a vacuum. An electromagnetic wave is perfectly happy to do that. An electromagnetic wave, although it carries no mass, does carry energy. It also has momentum, and can exert pressure

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Deepak Jindal 7 years, 2 months ago

Yes.. they carry energy and momentum..

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ANSWER

???Nichrome and Copper wires of same length and same radius connected in series current is passed through them which wire get heated up more. justify your answer❓❔❓

Posted by Yo Yo Honey Singh ? 7 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Mohit Sepat 7 years, 2 months ago

And resistance is directly proportional to heat

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Mohit Sepat 7 years, 2 months ago

Nichrome wire because it has high resistance .

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ANSWER

Posted by A J 7 years, 2 months ago

CBSE > Class 12 > Physics

3 answers

G K 7 years, 2 months ago

Q for Queen..?

1Thank You

Deepak Jindal 7 years, 2 months ago

Charge

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Aryan Rajpoot 7 years, 2 months ago

Q denotes charge

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ANSWER

A matellic piece gets hot when surrounded by a coil carring high frequency alternating current.Why?

Posted by Aakash Kumar 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Mohit Sepat 7 years, 2 months ago

Due to passage of high current due to which resistance increase and ultimately heat increase .they all are directly proportional to each other as Q=RTI I ka square

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State and explain biot sarvart's law. Using law derivean expression for the magnetic field

Posted by Himanshi Monu 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How does the relaxation time of electron in the conductor change when the temperature of the conductor decreases?

Posted by Aayush Kaushal 7 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Anjana Sherawat 7 years, 2 months ago

Resistivity increases with increase in temperature.As resistivity is inversely proportional to relaxation time so it decreases with increase in temperature

1Thank You

Amit Mourya Amit 7 years, 2 months ago

Hhdjfkfmgigg

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ANSWER

Why should the jockey be not rubbed against potentiometer wire?

Posted by Aayush Kaushal 7 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Deepak Jindal 7 years, 2 months ago

Bcoz if we rub the jockey it will give wrong readings

1Thank You

Himanshi Monu 7 years, 2 months ago

Because jockey is rubbed on the potentiometer wire to detect correct equation

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ANSWER

What is radial magnetic field

Posted by Hitesh Sharma 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Deva Darshan 7 years, 2 months ago

A magnetic field , in which the plane of the coil in all positions remains parallel to the direction of magnetic field is called radial magnetic field . ... In a moving coil galvanometer, the magnetic field is made radial by using a field magnet with concave poles.

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ANSWER

Anyone could think that invisiblility is possible or not?according to me it is possible

Posted by Hy Shona 7 years, 2 months ago

CBSE > Class 12 > Physics

6 answers

G K 7 years, 2 months ago

To become invisible, an object must do two things: it must be able to bend light around itself, so that it casts no shadow, and it must produce no reflection

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G K 7 years, 2 months ago

I have checked on internet...there is nothing in this world which is completely invisible...research is going on....

0Thank You

Hy Shona 7 years, 2 months ago

Seriously it is too funny megha.But actually a body is only visible when reflection,refraction and absorbtion of light takes place.If it does not occur than abody can not be visible.so,i think to become invisible it is important to know the factors on which reflection ,refraction and absorbtion depends.

1Thank You

G K 7 years, 2 months ago

Yes, we can become invisible.....This happens in this situation such as a lecture from parents about responsibilities...

2Thank You

G K 7 years, 2 months ago

How can u say that Swati....

1Thank You

Srishti Gola 7 years, 2 months ago

Invisibility is possible but probably not for people

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ANSWER

Has anyone worked with a working model for chemistry ,physics and bio.does practcal has been started in any school?

Posted by Hy Shona 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Aryan Rajpoot 7 years, 2 months ago

In my school practicals have not been started but my biology teacher demonstrated us and I'm preparing for making a working model of sewage treatment plant

2Thank You

ANSWER

Does photoelectric effect can be used to generate electrcity

Posted by Hy Shona 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Srishti Gola 7 years, 2 months ago

Based on the classical description of light as a wave, they made the following predictions: The kinetic energy of emitted photoelectrons should increase with the light amplitude. The rate of electron emission, which is proportional to the measured electric current, should increase as the light frequency is increased.

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ANSWER

How a ray of light penetrate a surface during refraction.

Posted by Hy Shona 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

A long solenoid of 10turns /cm has a small loop of area 1cm×cm placed inside with the normal of the loop parallel to axis .calculate the volatage across the small loop if cureent in the solenoid is changed from 1A to 2A in 0.1s during the duration of the change?

Posted by Nandini I 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Magnetic induction

Posted by Ankit Roy Roy 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is physio

Posted by Raj Yadav 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is torroid and it expression?

Posted by Rahul Goyal 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 7 years, 2 months ago

A toroid is shaped like a solenoid bent into a circular shape such as to close itself into a loop-like structure. The toroid is a hollow circular ring, as can be seen in the image shown below, with large number of turns of enameled wire, closely wound with negligible spacing between any two turns.

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How to know the direction of induced current?

Posted by Samridhi Nagar 5 years, 8 months ago

CBSE > Class 12 > Physics