Which of the following will convert a milliammeter to a voltmeter?
low series resistance
low parallel resistance
high series resistance
high parallel resistance
parallel resistance equal to milliammeter resistance
Correct answer is C
No explanation has been provided for this answer.
0.05\(\Omega\)
1.00\(\Omega\)
1.50\(\Omega\)
2.00\(\Omega\)
2.50\(\Omega\)
Correct answer is D
The E.M.F of a circuit is given by
\(E=I(R+r)\)
Hence, E = 0.15(8+r) = 0.3(3+r)
1.2 + 0.15r = 0.9 + 0.3r
1.2 - 0.9 = 0.3r - 0.15r
0.3 = 0.15r
r = \(\frac{0.3}{0.15}\)
r = 2\(\Omega\)
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