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Solenoid Consider a rectangular Amperean loop PQRS. Along PQ the field is zero. Along transverse sections PS and QR, the field component is zero. Let the magnetic field along SR be B. Loop ∮ Bdl cosθ = μ0i ∮ B→dl→ = ∮ Bdl cosθ = R∫S Bdl cos0 + Q∫R Bdl cos90o + P∫Q Bdl cos180 + S∫P Bdl cos90o = B R∫S dl + 0 + 0 + 0 = Bl Current passing through loop – ??? Thus, the number of turns per unit length is ‘n’, then the total number of turns is ‘nh’. The enclosed current is Ie = I(?ℎ) where I is the current in the solenoid. From Ampere’s circuit law BL = μ0Ie, Bh = μ0I(nh) B = μ0nI

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What should be the refracted angles in class 12 prism experiment if the incident angles are 35,40,45,50,55,and 60 respectively

Posted by Surendra Karsh 6 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Gaytri Devi 6 years, 10 months ago

By using meu(u)=sini/sinr;i=35,40,45,50,55,60 u=1.55

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Curve

Posted by Pankaj Raj 6 years, 10 months ago

CBSE > Class 12 > Physics

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Why does galvanometer show deflection in opposite directions when connected at the two ends of slide wire?

Posted by Pallavi Pradhan 6 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Singh ? 6 years, 10 months ago

Due to magnetic effect of electric current.

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Is optics chapter is removed from class 12th syllabus?

Posted by Amit Sen Verma 6 years, 10 months ago

CBSE > Class 12 > Physics

4 answers

Vikas Goyal 6 years, 10 months ago

Not this year but next year wave optics is removed

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Aditi Raj 6 years, 10 months ago

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Akshat Sharma 6 years, 10 months ago

No it is of 14 marks , max. Vatage

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Hema Bisht 6 years, 10 months ago

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11th exams gone mi 12th started best vishes for boards 12th ??

Posted by ▪▪Amrit▪▪ ❤ 6 years, 10 months ago

CBSE > Class 12 > Physics

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will dc motor converted into ac generator and how??

Posted by Aman Kaur 6 years, 10 months ago

CBSE > Class 12 > Physics

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What are the most important topics which should be prepared to pass in the physics examination..?

Posted by Divyanshu Rai 6 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Vikas Goyal 6 years, 10 months ago

U will pass

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Vikas Goyal 6 years, 10 months ago

Check blue print and do firstly 5 marks questions then easy chp full

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How does a zener diode work?explain its principle

Posted by Meenakshi Vinod 6 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 10 months ago

Zener diode is a silicon semiconductor with a p-n junction diode which operates under reverse biased condition. It is used as a voltage regulator in d.c. circuit. The primary objective of the zener diode as a voltage regulator is to maintain a constant voltage. Let us say, if zener voltage of 5 V is used then, the voltage becomes constant at 5 V, and it does not change.

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Ohm's law statement

Posted by Shekhar Dixit 6 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 10 months ago

According to Ohm’s law, the current flowing through a conductor is directly proportional to the potential difference applied across its ends, provided the temperature and other physical conditions remain unchanged. Mathematically it can be represented as,

Potential difference ∝ Current

V ∝ I ( When the value of V increases the value of I increases simultaneously)

V = IR

Where,

V is Voltage in volts (V)

R is Resistance in ohm (Ω)

I is Current in Ampere (A)

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An ant is moving on a plane horizontal surface .the no. of degrees of freedom of the ant will be

Posted by Armaan D 6 years, 10 months ago

CBSE > Class 12 > Physics