Explain the phenomenon of diffraction. What is the condition for observing diffraction of light?
Derive the mirror formula for a concave mirror. Explain the significance of each term in the formula.
What is the root mean square (RMS) value of an alternating current? How is it related to the peak value of the current?
State Lenz’s law and explain how it follows from the law of conservation of energy. Give an example of its application.
Using Ampere’s circuital law, derive the expression for the magnetic field inside a long, straight current-carrying solenoid.
Explain the concept of drift velocity in conductors. Derive the relation between drift velocity and current in a conductor.
Derive the expression for the energy stored in a parallel plate capacitor with capacitance C and potential difference V between the plates.
State Gauss’s law in electrostatics. How would you use Gauss’s law to determine the electric field due to a long, uniformly charged wire?
Ramesh was not in class when this chapter was being taught. He came the next day and repeated what he had heard from his father. Can you tell Ramesh what is wrong with these statements?
a Women always vote the way men tell them to. So what is the point of giving them the right to vote?
b Party politics creates tension in society. Elections should be decided by consensus not by competition.
c Only graduates should be allowed to stand as candidates for elections.
Here are some reports of malpractices in Indian elections. Identify what the problem in each case is. What should be done to correct the situation?
a Following the announcement of elections, the minister promised to provide financial aid to reopen the closed sugar mill.
b Opposition parties alleged that their statements and campaign was not given due attention in Doordarshan aAll India Radio.
c An inquiry by the Election Commission showed that electoral rolls of a state contain name of 20 lakh fake voters.
d The hoodlums of a political party were moving with guns, physically preventing supporters of other political parties to meet the voters and attacking meetings of other parties.
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