Cathode rays are accelerated by a P.D. of 2000 volt and enter the plates of a Thomson tube as a collimated beam. The P.D. between the plates is 800 volt and the plates are separated by a distance of 1 cm. The path of the beam of electrons is normal to the electrical field. Find the magnetic field that must be applied perpendicular to the beam over the electrical field so that the beam is undeviated. e/m = 1.76 x 1011 C/kg.

Consider the mass spectrometer shown schematically in the figure below. The magnitude of the electric field between the plates of the velocity selector is 2.60 x 10³ V/m, and the magnetic field in both the velocity selector and the deflection chamber has a magnitude of 0.0400 T. Calculate the radius of the path for a singly charged ion having a mass m = 1.82 x 10-26 kg. Bo, in P m Detector array *** xx x x x xxxx x Velocity selector + x x x₂ x² x² x/ x

4+ 71. In Millikan's experiment, a potential difference of 2.0 is applied between the two plates, which are 8 mm apart, to balance an oil drop of mass 4.9 × 10-4 kg. Calculate the number of elementary charges on the drop (g = 10 m/s²). (7.6) m 106 mlo enters a 0.800 T. (8.2) TI (a) Determine the magnitude of the magnetic 101 exerted on the proton. (h) Dorcriho th tolro tho proton as it stays OFF /NO 2nd F CA MODE STAT VAR ALPHA SNI DEL SET UP RESET arc hypNOT sin1AND cos OR tan XOR DRGXNOR dhy sin COS DRG D 10 E A uj DEG STO Exp abc D°M'S DATA CD. -xy oy RANDOM re 6 sx*nPr ox CHEX CBINr ju 5. 2. 1. ANS 3. DEC

Mammography is an x-ray imaging procedure for breast cancer diagnosis and screening. Assume that 20ke V x-ray is used in mammography. Also assume that the breast of a patient is 6 cm in thickness (soft tissue), and the propagation speed of x-ray photons in soft tissue is about the same as in vacuum. How long will it take for x- ray photons to travel through the breast?

A beam of electrons with velocity vx = 5 x105 m/s is introduced into a uniform magnetic field Bz = 30 mTesla. An electric field Ey is applied perpendicular to both the initial velocity and the magnetic field. What value of electric field must be applied to leave the electron beam undeflected?

Electrons enter a magnetic field traveling at v, = vỹ. The constant, uniform magnetic field B = 0.75 2 T acts as a filter curving the electrons to a small gap that only allows specific electron energies. The source of electrons enters the filter as a beam that is 15 micrometers in diameter and have a range of energies from 5-25 meV. The filter redirects the beam, as pictured, to the right v = và but does not speed them up. If the filter is to further narrow the range of energies from 5-25 meV to 10-12 meV, find the dimensions of the gap. In the picture, calculate ymin and ymer, both of which can be assumed to be equal to the radius of the paths taken within the magnetic field. %3D The beam being focused to 15 um at the start can be assumed to be a point source and take circular paths within the magnetic field. Outgoing "Filtered" Electrons Blocked Electrons -不: Y Vma Incoming Electrons

A charged particle is injected at 121 m/s into a 0.0721-T uniform magnetic field perpendicularly to the field. The diameter of its orbit is measured and found to be 0.0491 m. What is the charge-to-mass ratio of this particle? charge-to-mass ratio: C/kg

A 0.160–A current is charging a capacitor that has circular plates 11.4 cm in radius. The plate separation is 4.00 mm. (a) What is the time rate of increase of electric field between the plates? V/(m·s)(b) What is the magnetic field between the plates 5.00 cm from the center?