Question 1 (3.5. pts) a. Rub a plastic pen on a piece of cloth. Bring it near to

Question

Question 1 (3.5. pts) a. Rub a plastic pen on a piece of cloth. Bring it near to small pieces of paper put on table. What will you observe? Use the knowledge on electrostatics to explain the phenomen b. Now, instead of small pieces of paper, you have aluminum filings (small pieces aluminum) on the table. Whal happens to then if you bring the rubbed plastic pen nea them? Explain why Question 2 (4.5 pts) A uniformly charged thin ring has radius a = 12.0 cm and total charge q = +22.0 nC. a. Find the electric field and the electric potential at point P situated on the axis of the r at a distance b-16.0 cm from the center O of the ring. b. An electron is placed on the ring's axis and is constrained to stay on the axis of the rin i. The electron is at point P and then released from rest. Describe the subsequent moti of the electron ii. What is the speed of the electron when it is at the centre O of the ring. 0 ii. If the electron is initially at a point M in the ring axis, at a distance c from the cen O, such that c

Explanation / Answer

Q.1]

a] The act of rubbing plastic pen against a cloth induces a charge imbalance in the pen thereby making it negatively charged. This pen when introduced near small pieces of paper, the paper bits which were previously neutral now develop a charge re-distribution. The re-distribution of charge allows them to get attracted to the plastic pen and so one observes the paper bits sticking to the pen.

b] Aluminium is a conductor (unlike plastic and paper which are dielectric objects) and such materials do not have a charge re-distribution mechanism (because they have free electrons in their structure). Therefore, the aluminium filings will not get attracted to the plastic pen.

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