Hello Science

 Question 1. A charge moving with a velocity v in X-direction is subjected to a field of magnetic induction in the negative X direction. As a result, the charge will: (a) remain undefeated (b) retard along X-axis (c) start moving in a circular path in YZ plane. (d) move along a helical path around X-axis. Answer Answer: (a) remain undefeated Question 2. Two thin long parallel wires separated by a distance r are carrying a current I amp. each. The magnitude of the force per unit length applied by one wire on the other is: (a)  µ 0 I 2 r 2 (b)  µ 0 I 2 2 π r (c)  µ 0 I 2 π r (d)  µ 0 I 2 4 π r Answer Answer:  (b)  µ 0 I 2 2 π r Question 3. A wire is placed parallel to the lines of force in a magnetic field and a current flows in the wire, then: (a) The wire will experience a force in the direction of the magnetic field. (b) The wire will experience a force in a direction opposite to the magnetic field. (c) It will experience a force in a direction perpendicular to the lines of force. (d)