(II) Calculate the ratio of the resistance of 10.0 m of aluminum wire 2.2 mm in diameter, to 24.0 m of copper wire 1.8 mm in diameter.

Only ans Q19

(b) 1. A platinum resistance sensor has a resistance of 100 2 at 0 °C and a temperature coefficient of resistance (oc) of 4 x 10 "C. If the resistance of the sensor is 125 O, find the corresponding temperature of the sensor. ii. A variable dielectric capacitive displacement sensor consists of two square metal plates of side 5 cm, separated by a gap of 1 mm. A sheet of dielectric material 1 mm thick and of the same area as the plates can be slide between them as shown in Figure Q.4b. Given that the dielectric constant of air is 1 and that of the dielectric material is 4, calculate the capacitance of the sensor when the input displacement x-0.0 cm, 2.5 cm and 5,0 cm. Figure Q4b

What are the readings of the voltmeters and ammeters in the picture? Assume two significant digits in resistance values.

(a) Of what material is a wire made, if it is 20.0 m long with a 0.150 mm diameter and has a resistance of 18.0 N at 20.0°C? O lead copper O aluminum O silver (b) What is its resistance (in 2) at 130°C?

A conductor has a resistance of R. it was cut into twelve even pieces. Six of them are connected in series, six are connected in parallel. Then they are again connected in series. Find the total resistance. (10) 1

(II) Two aluminum wires have the same resistance. If one hastwice the length of the other, what is the ratio of the diameterof the longer wire to the diameter of the shorter wire?

(a) To what temperature must you raise a copper wire, originally at 20 °C, to double its resistance, neglecting any changes in dimensions? Use a = 3.9×10 1 -3 O Yes No O T= (b) Does this happen in household wiring under ordinary circumstances?

Te-Learning Portal Courses - Reports e-Services ▼ Academic Departments - ETC - CIMS Salim During an experiment to verify Ohm's law, the voltage supplied and the current through a circuit are measured. [Voltage is measured in Volt (V) and current in Ampere (A)]. ww R on Battery The measured value of the current is I = 3.1 ± 0.2 A and that of the voltage is V = 14 0.5 V. The resistance of the circuit (in N) can be calculated using the formula, R = V/I, Calculate the, a) Resistance (in 2) = b) Fractional uncertainty in the resistance = c) Absolute uncertainty (in 2) in the resistance=

(II) A certain copper wire has a resistance of At 15.0 Ωwhat point along its length must the wire be cut so that the resistance of one piece is 4.0 times the resistance of the other? What is the resistance of each piece?