Question

State the rule that is used to find the direction of field acting at a point near a current-carrying straight conductor.

(a) Cork rule

(b) The right-hand thumb rule

(c) Swimming rule

(d) Flemings rule

This question was posed to me during an internship interview.

Asked question is from Magnetic Field due to a Current Element & Biot-Savart Law topic in portion Moving Charges and Magnetism of Physics – Class 12

Answer 1

Right answer is (b) The right-hand thumb rule

The best explanation: Right-hand thumb rule can be used to find the direction of the magnetic field at a point near a current-carrying conductor. Right hand rule states that, if the thumb of the right hand is in the direction of the current flow then, the curl fingers show the direction of the magnetic field.