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A magnet of total magnetic moment  A-  (cos t) where b =1 Tesla and  rad/s. The work done for reversing the direction o

(a)

0.007 J

(b)

0.014 J

(c)

0.01 J

(d)

0.028 J

f the magnetic moment at t = 1 second, is


Question ID - 50225 :-

A magnet of total magnetic moment  A-  (cos t) where b =1 Tesla and  rad/s. The work done for reversing the direction o

(a)

0.007 J

(b)

0.014 J

(c)

0.01 J

(d)

0.028 J

f the magnetic moment at t = 1 second, is

1 Answer
5876 Votes
3537

Answer Key : (b) -

Work done, W= ( ).

    =2×  1 cos(0.125)

    =0.02 J

 correct answer is (b)



Next Question :

To mop-clean a floor, a cleaning machine presses a circular mop of radius R vertically down with a total force F and rotates it with a constant angular speed about its axis. If the force F is disturbed uniformly over the mop and if coefficient of friction between the mop and the floor is the torque applied by the machine on the mop is :

(a)

FR

(b)

FR/3

(c)

FR/2

(d)

FR/6


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