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A , B , C and D are four resistance of 2Omega , 2Omega , 2Omega and 3Omega respectivey. They are used to form a wheatstone bridge. The resistance D is short circuited with a resistance R in order to get the bridge balanced. The value of R will be

A : Poultry farming has definite advantage over live-stock rearing R : Poultry birds are easy to raise, can be acclimatised to a wide range of climatic conditions, have short life span and are prolific breeders

In a circuit shown in fig. the capacitance of each capacitor is equal to C and the resistance, to R One of the capacitor was connected to a voltage V_(0) and then at the moment t = 0 was shorted by means of the swich Sw . Find: (a) a current I in the circuit as a function of time t : (b) the amount of generated heat provided a dependence I(t) is known.

Consider the circuit shown in the figure. Capacitors A and B , each have capacitance C=2 F . The plates of capacitor A are shorted using a wire of resistance R=1 Omega while the left plate of capacitor B is given an initial charge Q=+4C . The switch is closed at a time t=0 . What will be the initial current (in ampere) drawn from the battery immediately after the switch is closed ?

Shows a rod of length l and resistance r moving on two rails shorted by a resistance R . A uniform magnetic field B is present normal to the plane of rod and rails. Show the electrical equivalence of each branch.

In the circuit shown in fig E_1 = 3 volts, E_2 = 2volts, E_3 = 1volt and R = r_1 = r_2= r_3= 1 ohm. (i) Find the potential difference between the points A and B and the currents through each branch. (ii) If r_2 is short circuited and the point A is connected to point B, find the current through E_1, E_2, E_3 and the resistor R.

(a) How many million year ago, gigantic reptiles used to dominate on earth ? Give their common name and also mention the period and year in which they were predominanat on earth. (b) Why did these gigantic reptiles disappear from the earth in a short duration ? (c ) Name the most advanced living reptiles. List atleast two characters in which they resemble in mammals.