A moveable (massless and frictionless) bar with a length of L = 18/50 m is being moved at a constant velocity of 60/10 m/s from left to right along two conducting rails by an external force, F, as shown in the Figure. If the system is immersed in a uniform magnetic field (out of the paper) with magnitude 18/100 Tesla, What is the induced current and its direction of the loop if the resistance is 18/5 Ω ?

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A: The solution for this question has been given below.

Q: How did you get 0.5 x 10^1 if 2 x 1000 is 2000 and 4 x 10^3 is 4000

A: How did you get 0.5 x 10^1 if 2 x 1000 is 2000 and 4 x 10^3 is 4000

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Q: wouldnt it be just 30 divided by 1.5 = 20

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A: mass (m) = 0.05 kg k = 150 Nm θ = 40 degree d = 1.8 m

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Ferromagnetism

Ferromagnetism is a mechanism by which some materials show magnetic properties. Iron and magnetite, an oxide of iron, are two naturally occurring materials that show the property of ferromagnetism. The word ferromagnetism is derived from the Latin name of iron, "Ferrum" as it was the first observed material to show such property. The property of ferromagnetism is shown by only a few substances such as iron, nickel, cobalt, and their alloys. Some transition metals and alloys of rare-earth metals also show ferromagnetism.