Question

Question 5 (1 point) Which of the following statements are true? Select all that apply. Magnetic field inside an ideal solenoid is zero. When the magnetic dipole moment vector is oriented parallel to the magnetic field vector, the potential energy is minimized. In cyclotron motion in a uniform magnetic field, the period of motion depends on the magnetic field strength and the radius of the circle. In a velocity selector, both protons and electrons will pass through undeflected if they have the same velocity and their speed v=E/B.

Answer 1

Magnetic field inside the solenoid is non zero B=u nI Ho = 411x107 T m/A n=number of turns per unit length I= current passing thru the solenoid hence False potential energy of magnetic dipole is = U=-u.B u= magnetic dipole moment B=external magnetic field if both u and Bareparellel Uis minimum hence When the magnetic dipole moment vector is parellel to magentic field vector the potential energy is min imized True 2m the time period of the charged particle in in cyclotron motion =T=- Bq m=mass of the particle B=magnetic field time period doesnt depend on the radius hence False in velocity selector ifthe particlego undeflected the electric forceand magnetic force on thech arged particleare equal =>qE=Bqv E B and hence True =>V=

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