(a) A dc current in a wire (b) A permanent magnet (c) An accelerated charge (d)
ID: 2291424 • Letter: #
Question
(a) A dc current in a wire (b) A permanent magnet (c) An accelerated charge (d) An electric field linearly changing with time (e) A charged disk rotating at uniform speed 7.2 Identify the configuration in Figure 7.24 that is not a correct representation of I and H 7.3 Consider points A, B, C, D, and Eon a circle of radius 2 as shown in Figure 7.25. The items in the right-hand list are the values of a, at different points on the circle. Match these items with the points in the list on the left. (c) C (ii) a, (d) D (iv)-a, FIGURE 7.24 For Review Question 7.2 ax + a, (e)E (v) (vi) - V2 (vii) 45 F9. 7.25 (vii) V2Explanation / Answer
As per Chegg policy only 7.3 will be solved:
Solution:
Option a is correct as per the right hand rule. The right hand rule states that the magnetic field lines H around a long wire which carries an electric current i form concentric circles around the wire. The direction of the magnetic field is perpendicular to the wire and is in the direction the fingers of your right hand would curl if you wrapped them around the wire with your thumb in the direction of the current.
Option b is correct as per right hand rue. dot means the current i is comimg towards you, i.e out of the page so if you wrap your right hand around the conductor and curl your fingers you would find the direction of H is counter clockwise, which is true in this case so option b is correct.
Option c is incorrect by right hand rule. If you curl your right hand fingers around the circular conductor the field H should come out of the page but instead the fields are going away from you (cross means going away from you i.e going into the page). So option c is incorrect because the direction of H is incorrect.
Option d is correct. If you curl your right hand fingers around the circular conductor the field H should come out of the page which is represented by a dot.
Option e is correct by right hand rule. Curl your right hand fingers around the conductor and the field H will be in clockwise direction.
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