When and why in some cases we are using thumb to represent CURRENT such as Magnetic field due to straight long current carrying conductor and in amperes circuital law whereas in current carrying circular coil and solenoid we use thumb to represent MAGNETIC FIELD? What is the deciding factor of what thumb represents in these cases?
When and why in some cases we are using thumb to represent CURRENT such as Magnetic field due to straight long current carrying conductor and in amperes circuital law whereas in current carrying circular coil and solenoid we use thumb to represent MAGNETIC FIELD? What is the deciding factor of what thumb represents in these cases?