Q.5 solve this

Q.5 solve this potential difference can be compared using a potentiometer and hence determine internal resistance Of the cell. 3. For three cells of emf E2 and E3 with internal resistances respectively connected in parallel, obtain an expression for net internal resistance and effective current. What w ould be the maximum current possible if the emf of each cell is E and internal resistance is r each? 4. Derive an expression for drift velocity Of the electron in conductor. Hence deduce ohm's law. 5. State the principle of potentiometer. How can it be used to • (i) Compare e .m.f 0t two cells Qi) Measure internal resistance of a cell? 6. Explain how does the conductivity 0t a . 7. 8. 2. (i) Metallic conductor conducto r and (iii) Insulator varies With the rise Of temperature. Derive expression tor equivalent e.m.t and equivalent resistance of a : (a) Series combination (b) Parallel combination of three cel& with e.rnf El. E2, E, & internal ræistarwes r, , rz, r3 Deduce the condiion for balancein a Whedstone bridge. using the principk of Wheatstone bridge. describe the method to determine the specific resistance of a wire in the laboratory. Draw the circuit diagram and write the formula used. Write any two important precautions you would observe performing the experiment. NUMERICALS The charge passing through a conductor is a function of ume and is given as q = 28 — 4t + 3 milli coulomb. Calculate (i) Current throtoh the condiEtor (ii) P Otential difference across it at t = 4 second. Given resistance o' conductor is 4 ohm. (Ans. : 12A. V The resistance Of a platinum Wire at a point is 5.00 Ohm and its Page 3 of 6

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