Homework Statement
A thin plastic rod of length L with total charge +q uniformly distributed along only the outer half-length is shown in Fig. 1. The rod is rotated at a constant angular speed w rad/sec about, and perpendicular to, the z-axis. Find the magnetic field B at the pivot...
Homework Statement
A long, straight, copper wire has a circular cross section with radius R, resistivity p and permittivity ε. If the current through the wire at any time t is sin(ωt) amperes, find the magnitude of the magnetic field B at time t a distance r from the centre of the wire for r >...
That makes sense. However, it doesn't explain why the solutions manual does not consider the weight force of the bar when applying's N2L:
They solve
a = IlB/m
where m = 2.60 N/9.80 m/s^2 as you said. But I don't understand why it is not a = (IlB - mg)/m.
Homework Statement
A 2.60-N metal bar, 1.50 m long and having a resistance of 10.0 Ω, rests horizontally on conducting wires connecting it to the circuit shown below. The bar is in a uniform, horizontal, 1.60-T magnetic field and is not attached to the wires in the circuit. What is the...