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

Bohr model, description of the structure of atoms, especially that of hydrogen, proposed (1913) by the Danish physicist Niels Bohr. The Bohr model of the atom, a radical departure from earlier, classical descriptions, was the first that incorporated quantum theory and was the predecessor of wholly quantum-mechanical models. The Bohr model and all of its successors describe the properties of atomic electrons in terms of a set of allowed (possible) values. Atoms absorb or emit radiation only when the electrons abruptly jump between allowed, or stationary, states. Direct experimental evidence for the existence of such discrete states was obtained (1914) by the German-born physicists James Franck and Gustav Hertz.

0Thank You

ANSWER

Hchana

Posted by Tanay Sahu 4 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Imar Laskar 4 years, 3 months ago

What is significant figure?

0Thank You

Sharif Ahmad 4 years, 3 months ago

Define Bhor Modle

0Thank You

ANSWER

what is the potential difference for a plane surface?

Posted by Pooja Gupta Davmps Bagicha 4 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Nipun Chawla 4 years, 3 months ago

The potential difference for a plane surface is the work done in moving a positive charge from one point to another point on that surface. If the surface will be equipotential, then no work will be done and therefore, electric potential will be zero.

0Thank You

ANSWER

Write Biot-Savart’s law in vector form.

Posted by Satha Ankith 4 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Adeeba Arshiya 4 years, 3 months ago

dB =u0 I dl × r /4π r³

0Thank You

सत्य सनातन? 4 years, 3 months ago

Vector dB=meu not ×vector dL × vector r /4pi × r cube

0Thank You

ANSWER

Mathematical expression of drift of electrons and the origin of resistivity.

Posted by Learning Girl 4 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 4 years, 2 months ago

The property of the material to oppose the electric current is known as resistivity. It is inversely proportional to the drift of electrons.

0Thank You

ANSWER

Mention some special cases of biot savart's law.

Posted by Atharva Verma 4 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

If 4 identical charge particles of charge q each are placed at the vertices of regular pentagon then force acting on a charge -q kept at the centre of pentagon and here r is the distance of vertice from centre of pentagon

Posted by Shefali Gurung 4 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Basic of EMI chp

Posted by Himanshi Rajput 4 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is gauss law in magnetism

Posted by Dhroo Garg 4 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

⭐White Wolf⭐ 4 years, 3 months ago

The surface integral of magnetic field over a closed surface is always zero

0Thank You

ANSWER

What is whetstone bridge

Posted by Sunny Kumar 4 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Bhanvi Chauhan 4 years, 3 months ago

Wheatstone bridge is an arrangement of four resistance in the form of bridge which is used for measuring an unknown resistance quickly and accurately.

0Thank You

ANSWER

What is permittivity of free space

Posted by Sachin Poonia 4 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Himanshi Rajput 4 years, 3 months ago

8.85 *10 rays to power -12

2Thank You

ANSWER

Determine the resistance of a given wire with the help of a meter bridge and determine also the specific resistance

Posted by Dhirendra Yadav 4 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Sachin Tiwari 4 years, 3 months ago

The resistance of given wire with the help of a meter bridge and determine also the specific resistance

0Thank You

ANSWER

A metallic rod of mass per unit length 0.5 kg m-1 is lying horizontally on a smooth inclined plane which makes an angle of 30 ∘ with the horizontal. The rod is not allowed to slide down by flowing a current through it when a magnetic field of induction 0.25 T is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is

Posted by Hardikpareek Pareek 4 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is capictance

Posted by Rahul Dev 4 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Adeeba Arshiya 4 years, 3 months ago

Large amount charge can be stored in capacitor per unit voltage

0Thank You

Himanshi Rajput 4 years, 3 months ago

The ability to store charge or electrical energy

2Thank You

ANSWER

What is capicator

Posted by Rahul Dev 4 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Sapna Mourya 4 years, 3 months ago

It is a device which store charge. For example battery

0Thank You

Raunak Chauhan 4 years, 3 months ago

It is device that store electt charge

0Thank You

ANSWER

Electrostatic notes

Posted by Vishnu Sharma 4 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Riyaz Alam 4 years, 3 months ago

Meeme

2Thank You

Bhumika Agrawal 4 years, 3 months ago

Made by yourself

4Thank You

ANSWER

Dimension formula for force

Posted by Studious Fellow 4 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Sapna Mourya 4 years, 3 months ago

MLT^-2

0Thank You

Muskan Upadhyay 4 years, 3 months ago

Nm2

0Thank You

ANSWER

Orbital magnetic moment of an electron in nth orbit is

Posted by सत्य सनातन? 4 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Notes of chapter 4 ?

Posted by Himanshi Rajput 4 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Himanshi Rajput 4 years, 3 months ago

Thnx?

0Thank You

Anudeeksha Rajpoot 4 years, 3 months ago

Moving Charges and Magnetism Class 12 Notes Chapter 4 1. The space in the surroundings of a magnet or a current-carrying conductor in which its magnetic influence can be experienced is called magnetic field. Its SI unit is Tesla (T). 2. Oersted experimentally demonstrated that the current-carrying conductor produces magnetic field around it. When key K is closed, then deflection occurs in the compass needle and vice-versa, 3. Biot-Savart’s Law According to this law, the magnetic field due to small; current-carrying element dl at any nearby point P is given by 4. The relationship between μ0, ε0 and c is where, c is velocity of light, ε0 is permittivity of free space and μ0 is magnetic permeability. 5. Magnetic field at the centre of a circular current-carrying conductor/coil. 6. Magnetic field at the centre of semi-circular current-carrying conductor. 7. Magnetic field at the centre of an arc of circular current-carrying conductor which subtends an angle 0 at the centre. 8. Magnetic field at any point lies on the axis of circular current-carrying conductor 9. Magnetic field due to straight current-carrying conductor at any point P at a distance r from the wire is given by 10. The following figure shows the graphical representation of variation of B with distance from straight conductor. 11. Ampere’s Circuital Law The line integral of the magnetic field B around any closed loop is equal to μ0 times the total current I threading through the loop, i.e. Magnitude of magnetic field of a straight wire using Ampere’s law 12. Maxwell introduced the concept of displacement current. 13. Magnetic Field due to a Straight Solenoid (i) At any point inside the solenoid, B = μ0nI where, n = number of turns per unit length. (ii) At the ends of the solenoid, B = 1/2 μ0nI 14. Magnetic Field due to Toroidal Solenoid (i) Inside the toroidal solenoid, B =μ0nI, here, n =N/2πr ,N= total number of turns (ii) In the open space, interior or exterior of toroidal solenoid, B= 0

2Thank You

ANSWER

Sl unit of current

Posted by Akash Akash 4 years, 3 months ago

CBSE > Class 12 > Physics