state the principal of working of a meter bridge .draw the circuit diagram for finding an unknown resistance using an unknown resistance using a meter bridge
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the cost of fuel in running a vehicle is proportional to the square of the speed and is rs. 45 per hour for a speed of 15 km per hour . other expenses amount rs. 500 per hour .Find the most economical speed for the vehicle and also the minimum cost for a distance of 100 km
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