Which of the following methods CANNOT be used to produce a steel magnet? The
passing of an electric current through a solenoid
repeated stroking of the specimen with a magnet
repeated stroking of the specimen in opposite directions with magnets
heating of the specimen
hammering of the specimen in the earth's magnetic field
Correct answer is D
No explanation has been provided for this answer.
doubled
halved
a quarter of its former value
unchanged
four times the original value
Correct answer is C
F \(\alpha\) \(\frac{1}{d^2}\)
F x d2 = constant
F1 x (d1)2 = F2 x (d2)2
d2 = 2d1
F1 x (d1)2 = F2 x (2d1)2
F2 = \(\frac{1}{4}\)F1
5 mins
30 mins
50 mins
60 mins
120 mins
Correct answer is A
0.0033g = 1 coulomb
1.98gs = 1.98 x 1
= 600 cou.
Q = It
600 = 2 x t
t = 300sec = 5 mins
white light is an electromagnetic wave
the prism has all the colours of the white light
white light has undergone total internal reflection in the prism
different colours of white light travel with different speeds in glass
white ligth consist of yellow, green and red colours
Correct answer is D
No explanation has been provided for this answer.
41.8o
44.1o
60.0o
83.6o
120.0o
Correct answer is D
\(\frac{4}{3}\) = \(\frac{sin r_1}{sin 30}\) and \(\frac{4}{3}\) = \(\frac{sin r_2}{sin 30}\)
r1 = 41.8o and r2 = 41.8o
angle between them = r1 + r2
= 83.6o