അധിവർഷം ഉണ്ടാകുന്നത് എത്ര വർഷത്തിലൊരിക്കലാണ് ?
A4
B8
C2
D6
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എക്സറേ കണ്ടുപിടിച്ച ശാസ്ത്രജ്ഞനാണ്
Two wires A and B are made of same material and have the same length but different cross-sectional areas. If the resistance. of wire A is 9 times the resistance of wire B, the ratio of the radius of wire A to that of wire B is?