Guangdong Chen Siyou digital currency

1. The teacher is right, and the answer to the question is right. Using the right-hand spiral rule, the wire generates a magnetic field (thumb points to the direction of the current, four fingers bend is the direction of the magnetic field), and Lorentz force (magnetic field passes through the palm, four fingers point to the direction of the current, and thumb is the direction of the force). The reason why the rotation direction of the two cases is different is that the current direction of the wire that can rotate is different, You're going to have to figure it out

2. F=kQ1Q2 & #92;( R*R)