Before revision: conducted a Near-Null Magnetic Field experiment under white light and long-day conditions using the homemade equipment of combing three couples of Helmholtz coils in vertical, north-south, east-west direction compensating near-null magnetic field.
After revision: conducted a Near-Null Magnetic Field experiment under white light and long-day conditions using the homemade equipment of combining three couples of Helmholtz coils in vertical, north-south, east-west direction compensating near-null magnetic field.