Problem 4 A horizontal metal bar falls under the influence of gravity. The central half of the bar is in a region of strong uniform magnetic field B2 ends of the metal bar are in contact with, but not slowed by, vertical metal rails that are connected at ground level to form a complete circuit. The length of the bar is L = 0.80 m, the mass of the bar is m = the bar is R = 0.50 N. The resistance of the remainder of -0.5 T (in the -z direction). The A B y B 0.120 kg and the resistance of h the circuit is negligible. What is the magnitude of the emf Ɛ when the а) velocity of the bar is v, = –2.0 m/s? L/2
KVL and KCL
KVL stands for Kirchhoff voltage law. KVL states that the total voltage drops around the loop in any closed electric circuit is equal to the sum of total voltage drop in the same closed loop.
Sign Convention
Science and technology incorporate some ideas and techniques of their own to understand a system skilfully and easily. These techniques are called conventions. For example: Sign conventions of mirrors are used to understand the phenomenon of reflection and refraction in an easier way.
For b, the answer gives that the direction of the current is clockwise? Why is that? cuz I thought it was counterclockwise, because B points inward and the flux of B is increasing. The answer also says Vb > Va, why is that?
(plz notice: this is not a graded question, it's a practice problem that comes with an answer which I don't quite understand, you can see from how I asked the question that the answer is provided to me...)
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