force on charge and current

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1. An alpha particle moves with a speed of 5x10 ^6 m/s at an angle of 30degree with respect to magnetic Field of induction 10^ -2T Find the force on particle

• 8x10-21 N
• 8x10-18 N
• 8x10-15 N
• 8x10-14 N

2. flux density of magnetic Field to cause 0.1MeV to move in a circular path of radius 10cm (mass 9×10 -31kg and charge 1.6×10-19C)

• 0.0106T
• 0.0206T
• 0.0306T
• 0.0406T

3. A 5.0MeV proton is falling vertically downward through a region of magnetic Field 1.5 T acting horizontally from south to north , find the magnitude of the magnetic Force exerted on the proton (take mass of proton = 1.6×10-27kg )

• 7.59x10-10 N
• 7.59x10-2 N
• 7.59x10-12 N
• 7.59x10-18 N

4. What is the nature of force between two parallel current-carrying conductors if direction of current in same direction.

• attractive
• repulsive
• both attractive and repulsive
• none of these

5. The resistance of an ideal voltmeter is

• zero
• infinite
• both ( a) and (b)
• none of these