तीन संकेन्द्री धातु कोष A , B तथा C जिनकी त्रिज्याये क्रमशः a , b तथा `c(a lt b lt c)` है, पृष्ठ -आवेश-घनत्व क्रमशः `+sigma, -sigma` तथा `+sigma` है कोष B का विभव होगा :

The sum of cost prices of A and B is Rs. 1200. The sum of the selling prices of A and B is Rs. 1390. If the profit of 10% and 20% is obtained on A and B respectively, then find the ratio between the cost prices of A and B. A तथा B के लागत मूल्यों का योग रु 1200 है | A तथा B के विक्रय मूल्यों का योग रु 1390 है | यदि A तथा B पर क्रमशः: 10% तथा 20% लाभ कमाया जाता है, तो A तथा B के लागत मूल्यों का अनुपात कितना है?

A, B and C are three points on a circle such that the angles subtended by the chords AB and AC at the centre O are 80^@ and 120^@ , respectively. The value of angle BAC is: A, B तथा C एक वृत्त पर स्थित तीन ऐसे बिंदु हैं कि जीवाओं AB तथा AC के द्वारा केंद्र पर अंतरित कोण क्रमशः 80^@ तथा 120^@ हैं | कोण BAC का मान क्या है ?

Three concentric metal shells A, B, and C of respective radii a,b and c (a lt b lt c) have surface charge densities +sigma, -sigma and +sigma respectively. The potential of shell B is

Three concentric spherical metallic spheres A,B and C of radii a , b and c(a lt b lt c) have surface charge densities sigma , -sigma and sigma respectively.

Three concentric spherical metallic spheres A,B and C of radii a , b and c(a lt b lt c) have surface charge densities sigma , -sigma and sigma respectively.