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Q1)The quantity of charge q (in coulombs) that has passed through a surface of area 2...

Q1)The quantity of charge q (in coulombs) that has passed through a surface of area 2 cm² varies with time according to the equation q=2t^3+ 4t - 6, where t is in seconds. What is the value of the curront density (A/m^2) at t= 6.0 s?

Q2) A thin copper rod has a mass per unit length of 0.1 kg/m. What is the minimum current in the rod that wonld allaw it to levitate above the ground in a magnetic field of magnitude 0.55 T? (g = 10.0 m/s²) ?

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