(a) The given figure shows the current passing through the straight conductor XY. (i) Copy the diagram and…
(a) The given figure shows the current passing through the straight conductor XY.
(i) Copy the diagram and draw the magnetic field lines when current flows from conductor X to Y.
(ii) Name and state the rule used in determining the direction of the magnetic field lines in the situation given above.
(iii) State Fleming's left hand rule. Using this rule, determine the direction of force applied on an electron entering a uniform magnetic field as shown in the figure.
Solution
(a) (i) [circuit diagram: variable resistance, ammeter (A), battery, key (K), compass needle at point Q with concentric magnetic field lines, points X and Y marked on the circuit]
(ii) Right hand thumb rule
Statement of the rule - Imagine holding a current carrying straight conductor in the right hand such that the thumb points towards the direction of current, then the fingers will wrap around the conductor in the direction of the field lines of the magnetic field.
(iii) • According to Fleming's left-hand rule, stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular. If the first finger points in the direction of magnetic field and the second finger in the direction of current, then the thumb will point in the direction of motion or the force acting on the conductor.
• Out of the plane/ upwards
