Following figure shows four situations in which positive and negative charges moves horizontally through a region and gives the rate at which each charge moves. Rank the situations according to the effective current through the region greatest first

i = i i = i i i = i v

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i > i i > i i i > i v

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i = i i = i i i > i v

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i = i i = i i i < i v

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Solution

The correct option is C $i = i i = i i i > i v$
For figure (i) $i_{1} = 7 A$
For figure (ii) $i_{2} = 4 + 3 = 7 A$
For figure (iii) $i_{3} = 5 + 2 = 7 A$
For figure (iv) $i_{4} = 6 - 1 = 5 A$

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Question 23
An electrolytic cell consists of:
(i) positively charged cathode.
(ii) negatively charged anode.
(iii) positively charged anode.
(iv) negatively charged cathode.

(a) (i) and (ii)
(b) (iii) and (iv)
(c) (i) and (iii)
(d) (ii) ad (iv)

Rank the following velocities according to the kinetic energy a particle will have with each

velocity, greatest first: (i) $\to v = 4^i + 3^j$ (ii) $\to v = - 4^i + 3^j$ (iii) $\to v = - 3^i + 4^j$ (iv) $\to v = 3^i - 4^j$ (v) $\to v = 5^i$ (vi) $\to v$ = $5 \frac{m}{s}$ at $30^{\circ}$ to the horizontal.