The strength of an electromagnet increases with
Increases in the number of turn of the coil
Decreases in current with the coil
Increases in the distance between the pole
Increases in current without the coil
Correct answer is A
No explanation has been provided for this answer.
2 × 1018HZ
3 × 10 19HZ
3 × 1021HZ
3 × 10-19HZ
Correct answer is C
\(Wavelength (\lambda) = 10^{-13}m\)
Speed of X-ray = speed of light \(C = 3×10^{8}m/s\)
Frequently (f) = ?
\(Using V = f\lambda (or (– f π for electromagnetic wave)\)
\(f = \frac{c}{\lambda} = 3 \times 10^{8} ÷ 10^{-13} = 3 \times 10^{8} \times 10^{13}\)
= \(3 \times 10^{8} \times 10^{13}\)
= \(3 \times 10^{21}Hz\)
The symbol −10X used to represent which of the particles?
Proton
Neutron
Electrons
Atoms
Correct answer is C
Electron: A sub–atomic particle haring a negative charge and orbiting the nucleus (note: the symbol 0–1e represent the particle of an electrons.)
The optical instrument which is suitable for viewing a nearby objects is ………..?
Telescope
sextant
microscope
periscope
Correct answer is C
Microscope is used for nearby object
4 rads–1
1rads–1–1
3–1rads–1
4rads–1–1
Correct answer is C
M= 3kg, r = 0.7m, v = 2m/s
v = wr
w = angular velocity
r = radius in an tangential circular
v = speed of an object
W = V/δ = 2/ 0.7 = 2.85
W = 2.853rads–1 (total interest whole number)
W = &approx.; 3rads–1Angular velocity (w) = 3rads–1