A power cable carries a 100 A current. At what distance from the wire is the
magnetic field equal to that of the
Earth, 5.00 x 10-5 T?
[?] m
No links please

The sun's gravitational pull is weaker on the planets that are closer to it, i think.

How is it possible that phylogenies based on sequences from nuclear genomes and organellar genomes (i.e., chloroplasts and mitochondria) from the same group of species yield phylogenetic trees with different branching orders?   answer :   the genome of the endosymbiont is more closely related to members of the group in which it originally evolved, while the nuclear genome of the engulfing organism has its own evolutionary trajectory.