21-14 - CONCEPTUAL EXAMPLE 2| —'HI Shielding and safety...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: CONCEPTUAL EXAMPLE 2| —'HI Shielding, and safety in a storm. A neutral hollow metal box is placed between two parallel charged plates as shown in Fig. 21—38a.What is the field like inside the box? RESPONSE If our metal box had been solid, and not hollow, free electrons in the her: would have redistributed themselves along the surface until all their individual fields would have canceled each other inside the box. The net field inside the box would have been zero. For a hollow box, the external field is not changed since the electrons in the metal can move just as freelv as before to the surface. Hence the field inside the hollow metal box is also zero, and the field lines are shown in Fig. 214813.91 conducting box used in this wag.r is an effective device for shielding delicate instruments and electronic circuits from unwanted external electric fields. We also can see that a relatively,r safe place to be during a lightning storm is inside a parked car, surrounded by metal. See also Fig. 21—39. where a person inside a porous “cage" is protected from a strong electric discharge. ...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern