A
B
C
E
Correct answer is D
- Charge are mostly concentrated at the outermost part of a hollow conductor
- Charge are also mostly concentrated at the pointed ends or places with high density point.
wavelength
wave coast
wave trough
wave front
Correct answer is D
Wave front is a line or section taken through an advancing wave in which the particles are in phase.
1.22KHz
2.40KHz
8.12KHz
1.22Hz
Correct answer is A
| f\(_1\) | = | f(v - v\(_o\))
v - v\(_s\) |
= | 1200(340 - 15)
340 - 20 |
= | 1.22KHz |
The Earth's magnetic equator passes through Jos in Nigeria. At Jos, the
angle of variation is zero
magnetic declination is 90
angle of dip is zero
horizontal component at the Earth's field is zero
Correct answer is C
- angle of dip is zero at the magnetic equator
- angle of variation is the same as angle of declination.
Calculate the velocity ratio of a screw jack of pitch 0.2cm if the length of the tommy bar is 23cm
230\(\pi\)
23\(\pi\)
70\(\pi\)
140\(\pi\)
Correct answer is A
P = 0.2cm, L = r = 23cm
| VR | = | 2πr
P |
= | 2πL
P |
= | 2π×23
0.2 |
= | 230π |
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