Answer:
The net torque about the pivot is and the answer is 'c'
c.
Explanation:
The torque is the force apply in a distance so it is the moment so depends on the way to be put it the signs so:
Now to find the net Torque is the summation of both torques
Answer:
Total 3 holes are available for conduction of current at 300K.
Explanation:
In order to develop a semiconductor, two type of impurities can be added as given below:
Now for estimation of extra electrons in the impured structure is as
Now for estimation of "holes" in the impured structure is as
Now when the free electrons and "holes" are available in the structure ,the "holes" will be filled by the free electrons therefore
So total 3 "holes" are available for conduction of current at 300K.