A 10m length of aluminium wire has a diameter of 1.5mm. It carries a current of 12A. Find (i) the current density. (ii) the drift velocity (iii) the electric field in the wire. aluminium has approximately 10^29 free electrons per m^3
1. A carbon resistor of 47 k ohms is to be marked in the colour code . Write the sequence of colours .
2. A toaster produces more heat than a light bulb when connected in parallel to the 220 V mains
The methodology of questioning varies from examiner to examiner. The normal way of questioning is to start from the experiment you are alloted. Example: What experiment are you doing? Ans: To determine the value of unknown resistance using metre bridge...
Class 12 students can download study materials in Physics here. The materials are prepared by experts in the field and can be used for first time study or for a quick revision. Electrostatics Current Electricity Magnetic Effect of Current and Magnetism Electromagnetic induction and AC Electromagnetic Waves Optics Dual Nature of matter and energy Atoms [...]
Current electricity is one of the interesting as well as scoring chapter for the students of Class XII. Please find below a collection of questions and answers commonly asked in various Board Exams