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           1.    Why do we use connecting wires made of copper? 2.       A wire carrying current remains electrically neutral. Why? 3.       A large number of free electrons are present in metals. Why is there no current in the absence of electric field across it? 4.       Why do electrons acquire a steady drift velocity after applying a voltage? 5.       A wire of resistivity ρ is stretched to three times its length. What will be its new resistivity? 6.       Name any two physical parameters on which the resistivity of the material depends? 7.       Manganin and constantans are used for making standard resistors. Why? 8.       Two wires of equal length, one of copper and other manganin, have equal resistance. Which wire is thicker? 9.       Why is it dangerous to operate electrical appliances with wet hands? 10.    What is the effect of heating a conductor on the drift velocity of free electrons? 11.    Is it possible to make the resistance of metals equal to zer

AP Resonance tube experiment: measurement of velocity of sound Resonance is the specific response of a system which is capable of vibrating with certain frequency to an external force acting with the same frequency. The two conditions for occurring resonances are: i)                     The frequency of applied force must be equal to the natural frequency of the system. ii)                    The applied force must be in phase with the system. In resonance tube experiment we mainly use two apparatus: tuning fork and resonance tube apparatus. A tuning fork is a U shaped structure made up of steel or an alloy of the aluminum based on stem as shown in figure. The tuning fork is set in to vibration by striking into the rubber pad by holding the stem.                                                                                                                                                                                              AP Resonance tube appa