NCERT Class 12 Physics

The direction of the net magnetic force is always perpendicular to the plane of current-carrying conductors. The direction of the magnetic force is determined through the right-hand rule. 

The right-hand thumb rule states that if you wrap a wire in a way that the thumb points towards the flow of current. Then your curled fingers represent the direction of the field lines of the magnetic field

The "ampere" was defined based on the magnetic interaction. The scientific community used the magnetic force between two parallel current-carrying conductors placed at a distance. Below is the definition of 1 ampere, based on this concept.

The exact formula for the magnetic force per unit length between two parallel current-carrying conductors:

For more information, check: Force between parallel conductors

If you want the Current Electricity Class 12 important questions, then check the Class 12 Physics previous year question paper pdf. Also, focusing on the Class 12 Physics past 5 years of exam questions to identify the current electricity class 12 important questions. Well, we have framed all the important questions in the NCERT Physics Class 12 Current Electricity solution pdf, which you can easily download through this article.

Before attempting the NCERT solutions PDF, solve the textbook exercise questions. Hereafter, verify your answer using the NCERT Class 12 Physics Ch 3 solutions pdf. Following a systematic approach to solve a problem will help to score good marks in the CBSE Class 12 board exam.

Class 12 Physics Chapter 3 Current Electricity is important for the board exam. The weightage of the chapter is 8-10%. When you practice the Current Electricity class 12 NCERT solutions, you get an overview of your preparation. If you are lacking in any concept, then it helps to build the conceptual knowledge.

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The best conductor of electricity is Silver (Ag) at room temperature. It is not used in normal wiring even though being the best conductor because of its high cost.

• Electrical Conductivity ($\sigma$): $6.3 \times 10^ {7} \ \text {S/m}$

• Electrical Resistivity ($\rho$): $1.59 \times 10^ {-8} \ \Omega \cdot \text {m}$ (the lowest among all metals)

This is an interesting question! Even though a proton has a positive charge, the net positive charge in a conducting material is always due to the removal of free electrons. 

This happens due to the availability of only free electrons in all conductors. Since protons are present in the nucleus, they can not roam freely in the conductor, as electrons travel freely in the conductor due to their presence in the outer shell.