A thin, horizontal copper rod is 1.43 m long and has a mass of 236 g. What is the minimum current in the rod that can cause it to float in a horizontal magnetic field of 0.546 T

The minimum current in the rod that can cause it to float 2.96 A.

Explanation:

Given;

length of the copper rod, L = 1.43 m

mass of the rod, m = 236 g = 0.236 kg

magnetic field, B = 0.546 T

The magnetic of the rod is given by;

Fm = BIL

The downward force on the rod is given by;

F = mg

For the rod to float, the difference in the two force will be zero;

BIL - mg = 0

BIL = mg

I = mg / BL

I = (0.236 x 9.8) / (0.546 x 1.43)

I = 2.96 A

Therefore, the minimum current in the rod that can cause it to float 2.96 A.

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