Directions: In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
In which of the following situations will there be no force? (1) A positive charge projected pass a piece of soft iron (2) A positive charge sent along the axis of a solenoid (3) Two parallel wires carrying current in the same direction (4) A positive charge projected between the poles of a magnet.A) 1 and 2 are correct
B) 2 and 3 are correct
C) 1 and 4 and correct
D) 1, 2 and 4 are correct
Correct Answer: A
Solution :
When positive charge projected pass piece of soft iron, it is, then not under then effect of magnetic field. For the positive charge moving along the axis of the solenoid the angle between\[\overrightarrow{V}\]and\[\overrightarrow{B}\]is zero. As \[F=qvB\sin {{0}^{o}}=0\].
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