"A loop of wire carrying a current of 2.0A is in the shape of a right triangle with two equal sides, each 15cm long. A 0.7T uniform magnetic field is parallel to the hypotenuse. The resultant magnetic force on the two equal sides has a magnitude of: "
"A. 0 B. 0.21N C. 0.30N D. 0.41N E. 0.51N"
"Helmholtz coils are commonly used in the laboratory because the magnetic field between them: "
"A. can be varied more easily than thefields of other current arrangements B. is especially strong C. nearly cancels Earth’s magnetic field D. is p...
"Of the three chief kinds of magnetic materials (diamagnetic, paramagnetic, and ferromagnetic), which are used to make permanent magnets?"
" A. Only diamagnetic B. Only ferromagnetic C. Only paramagnetic D. Only paramagnetic and ferromagnetic E. All three"