The force on a current carrying conductor in a magnetic field is greatest when the
conductor makes an angle of 60° with the field
force is idependent of the angles between the fields and the conductor
conductor is parallel with the field
conductor is at right angle with the field
Correct answer is D
The force on a current carrying conductor in a
magnetic field is greatest when the conductor lies perpendicular in the magnetic field
At reasonance, the phase angle in an a.c. circuit is
90°
60°
0°
100°
Correct answer is C
At reasonance in an a.c. circuit, during which the capacitive reactance Xc is equal to the inductive reactance Xl, the phase angle Ø = 0°
The process of energy production in the sun is
nuclear fission
nuclear fussion
electron collision
radioactive decay
Correct answer is B
The process of energy production in the sun is generally by nuclear fusion of hydrogen nuclei, the reaction of which takes place at a tremendous high temperature of the order of 107K.
H1 + H1
Which of the following metals will provide the greatest shield against ionizing radiation
Iron
Manganese
Alminium
Lead
Correct answer is D
No explanation has been provided for this answer.
120
100
1000
1200
Correct answer is B
For the transformer, V ∝ ∩
=> V s ∝ ∩s; Vp ∝ ʌp
=> Vp/Vv = ∩p/∩s, therefore 120/1200 = ∩p/1000
therefore ∩p * 1200 = 120 * 1000
∩p = 120*1000/1200 = 100