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Unformatted text preview: homework 04 KANUNGO, ANIL Due: Sep 11 2007, 4:00 am 1 Question 1, chap 23, sect 3. part 1 of 4 10 points Consider symmetrically placed rectangular insulators with uniformly charged distribu tions of equal magnitude as shown in the fig ures. x y + + + + Find the net electric field at the origin. 1. aligned with the positive yaxis 2. aligned with the positive xaxis 3. aligned with the negative yaxis 4. nonzero and not aligned with either the x or yaxis 5. aligned with the negative xaxis correct 6. zero with the direction undefined. Explanation: At the origin, the positive slab of charge produces an electric field pointed toward quadrant III (away from the positively charged slab). The negatively charged slab produces an electric field of equal magnitude (as the positively charged slab) but pointing toward quadrant II (toward the negatively charged slab). The xcomponents of the two fields add (producing E x < 0), while the y components cancel. Thus the electric field is along the negative xaxis. Question 2, chap 23, sect 3. part 2 of 4 10 points x y ++++ ++++ In the figure above what is the net field at the origin? 1. aligned with the negative yaxis 2. aligned with the positive yaxis 3. nonzero and not aligned with either the x or yaxis 4. aligned with the negative xaxis 5. zero and the direction is undefined cor rect 6. aligned with the positive xaxis Explanation: At the origin the upper slab produces an electric field that points toward quadrant III (away from the positively charged slab) and the lower slab an electric field that is points toward quadrant I (away from the positively charged slab). By symmetry, these two elec tric fields are equal in magnitude and opposite in direction, so the total electric field sums to zero. Question 3, chap 23, sect 3. part 3 of 4 10 points x y + + + + homework 04 KANUNGO, ANIL Due: Sep 11 2007, 4:00 am 2 In the figure above what is the net field at the origin? 1. aligned with the positive yaxis 2. zero with an undefined direction 3. aligned with the positive xaxis 4. aligned with the negative yaxis 5. aligned with the negative xaxis 6. nonzero and not aligned with either the x or yaxis correct Explanation: As in the previous Part, at the origin the upper slab produces an electric field pointing toward quadrant III (away from the positively...
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This homework help was uploaded on 04/02/2008 for the course PHY 303L taught by Professor Turner during the Fall '08 term at University of Texas at Austin.
 Fall '08
 Turner
 Charge, Work

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