Question

2. (40p)A conductive spherical shell of inner radius 2R and outer radius 3R is caries a net charge -3Q. The total charge of an insulating sphere with a radius R of the same center as the spherical shell is + 20. Using Gauss' law find the electrical field in the regions; a. r<R b. R<r <2R c. 2R<r <3R d. r > 3R >

Answer 1

Solutions +998 39 +24 Gauss's laco is qin ço 32 $2.da Se QR (a) ४ र २ tuke a pausiar surfarve of rading & then This Zin = fx 4783 3 8 = 28 au alto 3 4703 3 EKR3 248 B RS Applying gauss law $2.dopo Ein Co 298 /RS ço ExaT. R3 qur qkgo 420 R3 U RYDER This region is outside from the sphere of radius R. For outode point sphere is act as point change which is kept at the ongina

thens Ko (for point change re k x 28 Ry gr E PREY <BR conduiter We knoto when a charge given to a it vende or the surface of Conduetoo and sit in inside the conductor is zero. so, Electric at point rakte BR Cpprox Bk) due to -39 i 2600 Here eleetne gield is present due to +24 charge sphere only. 9 Yky *(24) pe 왕은 (el) ) BR For o BR cohole systen acta point charge which is kept at orgin.com fore, = 29-34 = -9 net charge (-9) -Ry ४९ 82
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