K.C.S.E Physics Q & A - MODEL 2014PP2QN16

K.C.S.E Physics Q & A - MODEL 2014PP2QN16

​(a) Figure 7 shows resistors R1 and R2 connected in parallel. Their ends are connected to a battery of potential difference V volts.

(i) In terms of V1, R1 and R2, write an expression for:
(I) current I, through R,. 
(II) current I2 through R,; 
(III) total current I in the circuit.

​(b) Figure 8 shows a negatively charged rod placed near an uncharged conductor resting on an insulating support.

​(i) Show the charge distribution on the conductor. 
(ii) State the effect:
(I) of momentarily touching the conductor with a finger while the charged rod is still near the conductor. 
(II) on the charge distribution of withdrawing the negatively charged rod after momentarily touching the conductor. 
(iii) In the space provided, sketch a diagram to show how the charge in ii (II) would have been distributed if the conductor was a sphere.

answers

​(b)(ii) (I) The conductor loses the negative charges to earth.
(II) The conductor acquires a net  positive charge/which redistributes itself.