Page 732 - SUBSEC October 2017_Neat

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02238020/CAPE SPEC/MS/2017

Question 1 continued KC UK XS

2

(ii)
Shape (2)- Increasing portion (1), saturation portion (1) 1

(iii) Correctly labelled axes (1)
1

I = I0 (1 – e -t/CR ) (1) 2

(e)
(i) T = C R (1)
= 1000 x 10 x 47 x 10 = 47 sec
-6
3
(1) (1)

(ii)

2

Free electrons are in random motion before the current
(f) is switched on. Collisions between electrons are common (1).

1
After the current is switched on, electrons are guided by the
electric field. They travel towards the positive potential
(1).

The drift velocity is average velocity of particles as they
are attracted to the positive potential. There are many

collisions (1).

(g)

2
Consider a segment of a conductor length L and cross-