When a charged particle moves with its velocity parallel to the direction of a m

Question

When a charged particle moves with its velocity parallel to the direction of a magnetic field, the panicle travels in a ___. a. straight line b. circular path c. depends on the sign of the charge on the particle A compass is placed directly above a strong bar magnet as shown below. Neglecting the magnetic field of the Earth, which direction will the compass point? An ideal solenoid has current I flowing through it, up in front and down in back, as shown right. Which of the following statements is true? a. The magnetic field inside the solenoid points to the right. b. The magnetic field inside the solenoid points to the left. c. The magnetic field inside the solenoid forms circles that follow the same direction as the current. d. The magnetic field inside die solenoid forms circles that flow in the opposite direction to the current. Which statements about the force on a charged particle placed in a magnetic field are true? a. The force is a maximum if the particle is moving parallel to the direction of the field. (b) A magnetic force is exerted only is the particle is moving. c. The force causes the particle to gain kinetic energy. d. The direction of the force is along the magnetic field. e. A magnetic field always exerts, force on a changed particle. A current carrying were is directed into the page as shown right. What is the direction of the magnetic field at point A?

Explanation / Answer

12) straight line

13) none of these ( AT the center magnetic field is zero)

14) the magnetic field inside the solenoid points to left ( from right hand rule )

15) the magnetic force is excerted only is the particle is moving

16) down ward

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