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A toroid is a long solenoid which is bend into circular form. So, toroid is equivalent to the solenoid having infinite length but it has finite no. of circular turns. Consider a toroid having radius r, carrying current I through it. If N is the number of turns in toroid and n be the no. of turns per unit length then n = N/2πr Magnetic field due to toroid again magnetic field due to infinite solenoid is B = nu•nI Magnetic field due to toroid then the magnetic field due to toroid is B = 2πr/nu•nI Magnetic field due to toroid

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Why current is perpendicular to the electric filed

Posted by Anshika Patel 7 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

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What is minimum size of the plane mirror in which man can see his full height? Explain.

Posted by Aarushi Dhiman 7 years, 3 months ago

CBSE > Class 12 > Physics

4 answers

Xyz Xyz 7 years, 3 months ago

h/2

1Thank You

Diya J 7 years, 3 months ago

Half height of a man

2Thank You

Aarushi Dhiman 7 years, 3 months ago

But in some books it is 1/3rd of height

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Nikhil Pawar 7 years, 3 months ago

Mirror length:-Half hight of man Can see full image

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Huygen's principle

Posted by Zahid Bashir 7 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

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Electric field intensity at axial position

Posted by Pratham Sharma 7 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

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an alpha particle of mass 6.55×10^-27 kg travels at right angle to a magnetic field of 0.2 T with a speed of 6×10^5 m/s. calculate the acceleration of alpha particle.

Posted by Amir Suhail 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Amir Suhail 7 years, 3 months ago

5.77×10^12 m/s^-2

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an electron enters electric field of 10^4 V/m perpendicular to the field with a velocity of 10^7 m/s. find the vertical displacement of electron after 2 milliseconds.

Posted by Amir Suhail 5 years, 8 months ago

CBSE > Class 12 > Physics

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a long wire carries a current of 20 A along the directed axis of a long solenoid. the field due to a solenoid is 4 mT. find the resultant field at a point 3 mm from the solenoid axis.

Posted by Amir Suhail 7 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

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A ball having velocity v towards right and having angular velocity clockwise approaches the wall. It collides elastically with wall and moves towards left. Ground and wall are frictionless. Select the correct statement about angular velocity of the ball after collision

Posted by Madhu Madhu 7 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

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What is ac and dc

Posted by Ajay Sharma 7 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Kiara Khurrana 5 years, 8 months ago

pagal aisili maza B.c mein hai

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Bharvi Dani 7 years, 3 months ago

AC alternating current DC direct current

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Ampere circutial law does works on finite wire

Posted by Preetparas Singh 7 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

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Relation between V H I and tita

Posted by Abdullah Khan 7 years, 3 months ago

CBSE > Class 12 > Physics

3 answers

Kiara Khurrana 7 years, 3 months ago

kahi aap tati ki baat toh nahi kar rehe hai

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Aastha Dixit 7 years, 3 months ago

V/H=tanAlpha

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H!Mαη$Hμ Ұαδαυ ✔️ 7 years, 3 months ago

Konse chapter ka question h

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What is polarisation and Brewster angle? in detail.

Posted by Surbhi . 7 years, 3 months ago

CBSE > Class 12 > Physics

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A current I is flowing along the length of an infinitely long,straight,thin-walled pipe .what is mag. field inside the pipe?

Posted by Satyam Singh Gurjar 7 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

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This year there is ray optics and optical instruments are in syllabus of class 12 or not

Posted by Stuti Mehra 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Pooja Sharma 7 years, 3 months ago

Yes . These are

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Why a static charge cannot produce magnetic field

Posted by Suraj Sj 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Pooja Sharma 7 years, 3 months ago

Thia is experimental phenomenon i think

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Inside a conductor electri field is zero,why

Posted by Bhavnesh Yadav 7 years, 3 months ago

CBSE > Class 12 > Physics

4 answers

Rahul Sharma 7 years, 3 months ago

Because electrons in a conductor moves freely not any one direction that's why the charge on conductor is zero ( neutral) so electric field is zero inside the conductor

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Ishu Singh 7 years, 3 months ago

Because workdone in moving a charge inside a conductor is zero then if workdone is zero so potential difference is zero and if pptential difference is zero then electric field is zero inside the conductor.

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Pooja Sharma 7 years, 3 months ago

Because whole charge resides outside the conductor due repulsion b/w electron

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Himanshu Yadav 7 years, 3 months ago

Because there is no charge inside a conductor as charge requires maximum distance from the centre

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What is the relation between f and R in reflection of concave mirrors

Posted by Shivam Rana 7 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Shivam Rana 7 years, 3 months ago

I need full derivation

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Stuti Mehra 7 years, 3 months ago

f=R/2

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state principle os superposition

Posted by Sl. Ngulngaisang 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Ishu Singh 7 years, 3 months ago

Principle of superposition states that force expirienced by a charge due to a charge is independent of presence of other charges . The net force expirienced by this charge is equal to the vector sum of forces exerted by other charges.

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Why magnet attract iron or metal

Posted by Aman Yadav 7 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

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Capacitor blocks dc why

Posted by Anjali Gupta 7 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Dharmender Sharma 7 years, 3 months ago

You can understand it like this as capacitor charge and discharges and this process continues in cap. so when you plot a graph of this process it resembles with graph of ac i.e. sinosodial in nature.hence it allows only a.c.not dc

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Why opposite charge attract each other

Posted by Dinesh Bhardwaj 7 years, 3 months ago

CBSE > Class 12 > Physics