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Three charges Q, +q, and +q are placed at the vertices of a right angled isosceles triangle as shown. The net electrostatic energy of the configuration is zero if Q is equal to

Fig (50)

a) – q / ( 1 + √ 2 ) b) – 2q / ( 2 + √ 2 ) c) – 2q d) + q

Chemistry

A substance A_xB_y crystallizes in a face centered cubic (FCC) lattice in which atoms ‘A’ occupy each corner of the cube and atoms ‘B’ occupy the centers of each face of the cube. Identify the correct composition of the substance A_xB_y.
a) AB₃
b) A₄B₃
c) A₃B
d) Composition cannot be specified

Mathematics

The value of

dx, a>0 is
(a)

(b) a

(c)

(d) 2

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