CIE iGCSE Co-Ordinated Science P1.6.1 Energy Exam Style Questions Paper 4
Question
Fig. 12.1 shows a large electromagnet used to lift scrap metal.
(a) The electromagnet lifts the car to a height of 15m. The car has a mass of 1200kg.
Calculate the work done on the car when it is lifted to a height of 15m.
The gravitational field strength is g =10N/kg.
work done = ……………………………………………… J
(b) The electromagnet is made from a solenoid.
Fig. 12.2 shows a solenoid.
(i) On Fig. 12.2 draw the pattern of the magnetic field produced when a current passes
through the solenoid.
Include an arrow showing the direction of the magnetic field.
(ii) The solenoid uses a current of 50A.
Calculate the amount of charge which flows through the solenoid in 30s.
State the unit for your answer.
charge = …………………… unit ……………………
(iii) The solenoid has a resistance of 5.0Ω when the current is 50A.
Calculate the power of the electromagnet.
power = …………………………………………….. W
(c) Electromagnets can be made much stronger than permanent magnets.
State one other advantage of using an electromagnet to lift scrap metal.
▶️Answer/Explanation
Ans : 12(a) (W =) mgh / 1200 × 10 × 15 ;
(W =) 180000 (J) ;
12(b)(i) correct shape of field ;
correct direction indicated on at least one field line ;
12(b)(ii) (Q =) It / 50 × 30 ;
(Q =) 1500 ;
C / coulombs ;
12(b)(iii) (V =) IR / 50 × 5.0 ;
(V =) 250 (V) ;
(P =) IV / 50 × 250 ;
(P =) 12500 (W) ;
12(c) can be switch off / on;