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Physics - Current Electricity Questions and Answer >>

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1. A metal wire of specific resistance 64 x 10-6 Ωcm and length 198 em has resistance of 7 Ω. The radius of the wire will be

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2. A wire of resistance 10 Ω is bent to form a circle,Pand Q are points on the circumference of the circle dividing it into a quadrant and are connected to a battery of 3 V and internal resistance 1 Ω as shown in the figure. The currents in the two parts of the circle are .

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3. The number of dry cells, each of emf 1.5 volt and internal resistance 0.5 ohm that must be joined in series with a resistance of 20 ohm so as to send a current of 0.6 ampere through the circuit is

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4. A uniform wire of resistance 9 n is cut into 3 equal parts. They are connected in the form of equilateral triangle ABC. A cell of emf 2V anj negligible internal resistance is connected across B and C. Potential difference across AB is

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5. Three resistors are connected to form the sides of a triangle ABC, the resistance of the sides AB, BC and CA are 40 ohms; 60 ohms and 100 ohms respectively. The effective resistance between the points A and B in ohms will be. [JIPMER 2002]

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