A single-turn square loop carries a current of 18A. The loop is 15cm on a side and has a mass of 0.035kg. Initially the
loop lies °at on a horizontal tabletop. When a horizontal magnetic ¯eld is turned on, it is found that only one side of
the loop experiences an upward force. Find the minimum magnetic ¯eld B (in mT), necessary to start tipping the loop
from the table.
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