Question

I only need help with Part D.

The attached figure on Bottom left of picture is figure 4.

CCH 20 W Interaction of a Current Loop with a Magnetic Field 9of 22 Candants The efects due to the interaction of a current caryng loop with a magnetic feid have many applications, some as common as the electric motor This protlem sates the basc principles of this interaction Part C ,when ts orontal sides of length&a perpendoular to Bsee the tigure Fg 3 What happens to the loop when tneaches the postion tor Wew Aeatable The diection of rotation changes because the net torue acting on the t o to otate in a docse drecton The net tore acting on the loe s ze be loop contues to rotate in acountenclocse dredon The net orue acting on the oe is ze he tt so the loop must be in equienum The met force acting on the loop z Prei Ane Corect Part D he sides of engh & and e op e paed chaway that ny the angle betwee loop with the magnec dce e oop to rae Now sppose that you change e wnr poon ef the loop reuve to and une B-13 shown in the are ore 4 Wheaono Vew Avalate e ounent tugh Figure 4 ot 4 egve and eds to rotate the oop ne drecton of decng ane se the ne ore adng on the loop (carent coming sp) rterdoc Yes, the net toroe acting s drecton of ong ge No he net orgue actng on the F Nohe ne force actng o the loop he loop in eqtn Sun tounest going down) (view from above) Next Provide Feedback

Answer 1

Part D

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If we use right hand rule, we see that magnetic force acts in the direction as shown below

(view from

This means

The forces point away from the center of the loop and cancel each other

therefore, correct answer must be first option

correct option - Yes, the net torque acting on the loop is negative and tends to rotate the loop in the direction of decreasing angle $\theta$ (clockwise)