At a particular instant, an electron moves eastward at speed V in a uniform magnetic field...
At a particular instant, an electron moves eastward at speed V in a uniform magnetic field that is directed straight upward. The magnetic force that acts on it is?
- A. zero.
- B. directed upward.
- C. directed to the south.
- D. none of the above.
Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in same directions....
- A. the wires repel each other.
- B. one wire is lifted slightly as the other is forced against the table's surface.
- C. the wires attract each other.
- D. both wires are lifted slightly.
Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in opposite directions....
- A. one wire is lifted slightly as the other is forced against the table's surface.
- B. both wires are lifted slightly.
- C. the wires attract each other.
- D. the wires repel each other.
At a particular instant, an electron moves eastward at speed V in a uniform magnetic field that is directed straight downward. The magnetic force that acts on it is..?
- A. zero.
- B. directed upward.
- C. directed to the south.
- D. none of the above.
Homework Answers
1) (d) None of the above
The actual direction will be to the north, which is not given in the options.
The direction is given by right palm rule:
The right hand rule states that, to find the direction of the magnetic force on a positive moving charge, the thumb of the right hand point in the direction of v, the fingers in the direction of B, and the force (F) is directed perpendicular to the right hand palm.
The direction of the force F on a negative charge is in the opposite sense to that above (so pointed away from the back of your hand).
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