Home 2nd Year Physics Notes Class 12 Physics Chapter 18 Short Questions and Numerical Notes – Electronics

# Class 12 Physics Chapter 18 Short Questions and Numerical Notes – Electronics

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In this post, I am sharing the Class 12 Physics Chapter 18 Short Questions and Numerical Notes PDF for the students of Intermediate Part 2. This chapter’s name is Electronics. Students can download the Class 12 Physics Chapter 18 Short Questions and Numerical Notes PDF on their laptops or mobile. These Physics Notes are for all the boards working under the Punjab Board like Gujranwala Board, Lahore Board, Faisalabad Board, Multan Board, Rawalpindi Board, Sargodha Board, DG Kahn Board, and Sahiwal Board. Here are the complete FSC 2nd Year Physics Notes PDF chapters.

## FSC Part 2 Physics Chapter 18 Short Questions and Numerical Notes – Electronics

Class 12 Physics Notes

#### How does the motion of an electron in a n-type substance differ from the motion of holes in a p-type substance?

As we know that the majority charge carriers in N-type substance are free electron and majority charge carriesrs in P-type substance are holes. Both electrons and holes are moving in opposite direction. The motion of electrons in N-type substances is much faster than the motion of holes in P-type substances.

#### What is the net charge on a n-type or a p-type substance?

P-type and N-type substances are neutral. Since they are made as a result of combination of atoms of intrinsic semi-conductors and atoms of impurity. Atom as whole is neutral therefore there is no net charge on P-type or N-type substancce..

#### Why charge carriers are not present in the depletion region?

In P-n junction, n-region contains free electrons and p-regioncontian holes. As electrons in the n-region due to their random motion diffuse into the p-region. As a result of their diffusion, the recombination of electrons and holes take place within depletion region is formed in which charge carriers are not present so depletion region has no charge carriers.

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