ચુંબકીય ચાકમાત્રા \({\text{ = }}\sqrt {n(n + 2)} \,\, = \,\,\sqrt {3(3\, + \,\,2)} \) \( = \,\,3.89\,\, \approx \,\,4BM\)
$A\,\,\,-\,\,\,B\,\,\,-\,\,\,C\,\,\,-\,\,\,D$