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Along with the syllabus, if the weightage is known, that works like the icing on the cake. Define biconcave lens. Clear all doubts with NCERT class 12 Physics Solutions for Chapter 10 Wave Optics prepared by subject experts at BYJU'S. Electric current is defined as the rate at which charge flows through a surface (the cross section of a wire, for example). Optics; Electromagnetism; Relativity; Acoustic; Thermodynamics; Motion In Physics; Force; Work Power And Energy; Current Electricity; Laws Of Physics. The proton is a "bare charge" with only about 1/64,000 of the radius of a hydrogen atom, and so is extremely reactive chemically. Download Free Mock tests and sample practice papers for your preparation of AIIMS 2019. This video tutorial has been designed to suit the curriculum of CBSE Class 12 students. Formulae form an integral part of your preparation. 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