In the electrical method of magnetisation, the polarity of the magnet depends on the
amount of current passed
direction of current
magnetic material used
size of the magnetic material
orientation of the magnetic material in space
Correct answer is B
No explanation has been provided for this answer.
36.0N
12.0N
6.0N
2.0N
1.0N
Correct answer is A
\(\frac{1}{6}F_E = F_{MOON}\)
FE = R = 6Fm
= 6 x 6 = 36N
2.2 x 10-6m
1.7 x 10-7m
8.0 x 10-7m
6.0 x 10-7m
4.5 x 10-7m
Correct answer is E
\(_an_w = \frac{\lambda_a}{\lambda_w}\)
\(\frac{4}{3} = \frac{\lambda_a}{\lambda}\)
\(\lambda_w = \frac{v}{f}\)
= \(\frac{3.0 \times 10^8}{5.0 \times 10^{14}} = 0.6 \times 10^{-6}\)
\(\lambda_w = \frac{3}{4} \lambda_a = \frac{3}{4} \times 0.6 \times 10^{-6}\)
= 4.5 x 10-7m
Which of the following are both mechanical and transverse?
infra-red rays
gamma rays
sound waves
water waves
micro waves
Correct answer is D
No explanation has been provided for this answer.
0.69m
1.38m
2.75m
5.50m
9.30m
Correct answer is B
\(\lambda\) = \(\frac{v}{f} = \frac{352}{256}\)
= 1.38