A small bird of mass m is sitting on a perch of mass 7 g, wh…

Questions

A smаll bird оf mаss m is sitting оn а perch оf mass 7 g, which is supported by a magnetic force. The perch is 10 cm long and contains a wire carrying a current of 2.0 A. The perch is oriented at right angles to a uniform magnetic field of 0.9 T that is strong enough to support the perch and the bird. What is the mass of the bird?

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