एक लंबा सीधा चालक ऊर्ध्वाधर ऊपर की ओर विद्युत धारा ले जाता है। तार के पूर्व में स्थित किसी बिंदु पर चुंबकीय क्षेत्र की दिशा क्या होगी?

How does the magnetic field at a distance r from an infinitely long wire change if the current is doubled?

The force on a current-carrying conductor in a magnetic field is maximum when _____.

An electron moves vertically downwards into a magnetic field directed towards the right. According to Fleming's Left-Hand Rule, the direction of the magnetic force acting on the electron will be: