Magnetic field of the straight wire carrying a current of 2 A, at a distance of 10cm or 0. lm from it is
This field acts perpendicular to the direction of the electron. So magnetic force on the electron is
F = qv B sin 90° = 1.6 x 10-19 x 106x 10-5 x 1
F = 1.6 x 10-18 N
Common Errors and Its Rectifications
Common Errors:
1. Students may not know about arrow mark in the figures, (diagram)
2. Students wrongly mention the unit of magnetic induction.
Eg. 0.5 x 10-5 Tesla.
Most of the children makes the mistakes in this area.
3. Student may confuse the direction of current versus produced magnetic induction.
Rectifications:
1. Arrow mark is importance to show where the electric and magnetic fields are directed.
2. The correct unit of magnetic induction of T (or) tesla.
3. If the current moves in upward the magnetic induction is anti-clock. If the current in downward, the magnetic induction is clockwise.