magnitude and direction of the magnetic field
given,
mass of wire = 8.7 gm or 8.7 * 10^-3 kg
current = 10 A
length of wire = 0.3 m
to levitate the wire force due to magnetic force should be equal to force due to gravity
force due to magnetic force = magnetic field * length * current
magnetic field * length * current = mass * g
magnetic field * 0.3 * 10 = 8.7 * 10^-3 * 9.8
magnetic field = 0.02842 T
direction will be into the page
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