本题目来源于试卷: Magnetism Magnetism，类别为 IB物理学
[问答题]
Two long wires carryi wj5yrj+2e ,xpwx3hu) ,ee(ir/u u/ou(gf0iq ng equal currents I are at r2ys(6 nk ro.cxe i/pw nn9m5+-mqac:x ight angles to each other, but don’t quite touch. Descririxx(:ynwnpqo5ka +./69cm-e2n scmbe the magnetic force one exerts on the other.
参考答案:
Consider
that the two wires are both horizontal, with the lower one carrying a current
pointing east and with the upper one carrying a current pointing north. The magnetic field from the upper wire points
downward on the east half of the lower wire and points upward on the west half
of the lower wire. Using the right hand
rule on the east half of the lower wire, where the magnetic field is downward,
the force points to the north. Using the
right hand rule on the west half of the lower wire, where the magnetic field is
upward, the force points to the south.
Thus, the lower wire experiences a counterclockwise torque about the
vertical direction due to the magnetic forces from the upper wire. This torque is attempting to rotate the two
wires so their currents are parallel.
Likewise the upper wire would experience a clockwise torque tending to
align the currents in the wires.
本题详细解析:
暂无
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