Which of the following statements are true? (Select all that apply.) a) A curren

Question

Which of the following statements are true? (Select all that apply.)

a) A current loop in a uniform magnetic field behaves like a small magnet.

b) The torque on a magnet tends to align the magnetic moment in the direction of the magnetic field.

c) None of these statements are true.

d) The drift velocity of electrons in a wire can be determined from the Hall effect.

e) The period of a particle moving in a circle in a magnetic field is always proportional to the radius of the circle.

f) The magnetic force on a moving charged particle is always perpendicular to the velocity of the particle.

Explanation / Answer

a) A current loop in a uniform magnetic field behaves like a small magnet. (true) it behaves like a magnetic bar or small magnet

b) The torque on a magnet tends to align the magnetic moment in the direction of the magnetic field.( true) torque on a magnet always tends to align tha magnetic moment in the direct of magnetic field

c) None of these statements are true.(false)

d) The drift velocity of electrons in a wire can be determined from the Hall effect.(true) The drift velocity is what makes the magnetic field,

q Vh *width = q Vd B

So Vd = Vh * width/B

e) The period of a particle moving in a circle in a magnetic field is always proportional to the radius of the circle.(true)The centripetal force of the particle is provided by magnetic Lorentzian force so that

qvB=mv2/r.

So it is inversely proportional to radius.

f) The magnetic force on a moving charged particle is always perpendicular to the velocity of the particle. (true) The direction of the force is always perpendicular to both the direction of movement of the charge and to the magnetic field.

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