Question 3 (a) In Figure Q3(a), a potentiometer consists of a 1.00 m long metal wire XY with resistance of 8.30 2. Wire

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Question 3 A In Figure Q3 A A Potentiometer Consists Of A 1 00 M Long Metal Wire Xy With Resistance Of 8 30 2 Wire 1 (46.42 KiB) Viewed 11 times

Question 3 (a) In Figure Q3(a), a potentiometer consists of a 1.00 m long metal wire XY with resistance of 8.30 2. Wire XY is connected in series with a driver cell of c.m.f. E₁ = 9.00 V and a resistor, r of resistance 1.42 2. Describe the c.m.f. of test cell. Ez if the balance length, I is found to be 0.745 m. X E₂ E₁-9 V r=1.42 2 Figure Q3(a) (3 marks) (b) A conducting sphere contains a positive charge of 5 µC on its surface. Electric field strength at a distance 0.01 m away from the surface of the sphere is 4.0 x 107 NC¹. Find the diameter of the sphere. (3 marks) (c) Two point charges are placed on the x-axis as follows: Charge q₁ +4.00 nC is located at x = +0.20 m and charge q2 +5.00 nC is at x = -0.30 m. Illustrate the magnitude and direction of the total force exerted by these two charges on a negative point charge q3= -6.00 nC that is placed at the origin (x=0)? (4 marks)