SELAMAT DATANG Kuiz Fizik Tingkatan 5 Bab 4
KUIZ INI MENGANDUNGI 10 SOALAN
1. According to Faraday's Law of Induction, the magnitude of the induced electromotive force (e.m.f.) in a conductor is directly proportional to what?
2. When the north pole of a bar magnet is pushed towards a solenoid, a current is induced. According to Lenz's Law, what will be the magnetic polarity of the end of the solenoid closest to the approaching magnet?
3. What is the primary function of the split-ring commutator in a direct current (DC) motor?
4. The force on a current-carrying wire in a magnetic field results from a 'catapult field'. In which region of this resultant field is the magnetic field weakest?
5. What is the key structural difference in the way the coil connects to the external circuit in an AC generator versus a DC generator?
6. An ideal step-up transformer is designed to change a 12 V input to a 48 V output. If the primary coil has 50 turns, how many turns must the secondary coil have?
7. In a simple DC motor, the coil continues to rotate past the vertical position even though the current is momentarily cut off. What is the reason for this continued rotation?
8. Which of the following rules is used to determine the direction of the force experienced by a straight wire carrying a current within a magnetic field?
9. Why will a transformer not operate if its primary coil is connected to a direct current (DC) power supply?
10. What is the primary purpose of the soft iron core in a transformer?