For what position of an object, …

For what position of an object, a concave mirror forms a real image equal in size to the object? Draw the ray diagram too. II. III. IV. V. Why do star twinkle? The potential difference between 2 terminals of an electric iron is 220V and the current flowing through its element is 5A. Calculate the resistance and wattage of the electric iron? Consider the circuit diagram as given below : If R1 = R2 = R3 =R4 = 3Ω, then the equivalent resistance of the circuit. Define ohms law, also draw the V-I characteristic for a metal conductor? Q.3 – LONG ANSWER QUESTIONS - : 1) a) Distinguish between the terms electrical resistance and resistivity of conductor? b) A copper wire of resistivity 1.63 x 10(-8)Ω-m has cross-section area 10.3 x 10(-4) cm2. Calculate the length of the wire required to make a 20 Ω coil. 2) A student has three concave mirrors A, B, and C of focal lengths 20cm, 15cm, and 10cm, respectively. For each concave mirror, he performs the experiment of image formation for three values of object distance of 30cm, 10cm and 20cm. a) For the three object distances, identify the mirror which will form an image equal in size to that of object. Find at least one value of object distance. b) Out of the three mirrors, identify the mirror which would be preferred to be used for shaving purpose. c) For the mirror B, draw ray diagram for image formation for any two given values of object distance.

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