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Answer:
61 ) total reistance given is 16 k ohm . When cut into 4 equal parts then each resistance is 4 k ohm. After applying it in parallel new resistance is 1 k ohm.
So, 1 k ohm = 10 n ohm
1000 ohm = 10 n ohm
n = 1000/ 10
n = 100.
62) r = 40 cm = 0.4 m
n = 20
B = 3 pi * 10^-2
using biot saverts law ,
B = µo n I / 2 pi r
put all the values in the formula,
I = 3 * 10 ^3 A
63) USe formula ---- F = q ( v × B )
charge on proton = 1.6 × 10 ^ -19 C
Hope it helps.