In Fleming's left-hand rule, with the thumb, index finger and middle finger held mutually perpendicular, the middle finger indicates the direction of the:

1. Fleming's left-hand rule relates current, field and force for a conductor in a magnetic field. 2. The chapter assigns: index finger to the magnetic field, middle finger to the current, and thumb to the force. 3. So the middle finger gives the current direction. 4. The option the magnetic field is given by the index finger, not the middle finger. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 4 "Effects of Electric Current", p.64_