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Q. A length of copper wire carries a current of 10 A, uniformly distributed through its cross section. The wire diameter is 2.5 mm, and its resistance per unit length is 2.5 /km.

Calculate the energy density of the magnetic field at the surface of the wire.

Q. A child slides across a floor in a pair of rubber-soled shoes. Thefriction force acting on each foot is 20.0 N. The footprint area ofeach shoe sole is 14.0cm2, and the thickness of eachsole is 5.00mm. Find the horizontal distance by which the upper andlower surfaces of each sole are offset. The shear modulus of therubber is 3.00 MN/

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Category:- Physics
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