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Part 1. Single Selection (3 Marks for each question. Total 30 Marks) 1. An electron is moving perpendicular to a 1.0T magnetic field. The electron has a velocity of 1 x 10 m/s. What is the magnitude of the force acting on the electron? (A) 1.6 x 10-13 N (B) 1.6 x 10-12 N (C) 1.6x10-אי (D) 1.6x10, N 2. The Points A through E on the Figurel represent various distances from the center of the current-carrying wire. Which point experiences the strongest magnetic field? (A) Point A (B) Point C (C) Point D (D) Point E 3.A wave has a frequency of 100 Hz and a wavelength of 1 m. What is the velocity of the wave? (A) 0.01 m/s (B) 1 m/s (C)10 m/'s (D) 100 m/s Figure 4. A wave of light -638 nm) enters a block of material. The wavelength of light within the material is 510 nm. What is the index of refraction of the material? (A) 0.5 (B) 0.8 (C)12 (D) 1.25 5. A jackhammer operator wears a set of protective headphones. Through the headphones, a sound wave is broadcast that is 180° out of phase with the jackhammer sound wave. The result is that he does not hear the sound of the jackhammer. The two sound waves are an example of which of the following? (A) Standing wave (B) Transverse wave (C) Destructi ve interference (D) Constructive interference 6. Four electrons are moving at the same velocity with respect to a magnetic field, but they are moving at different angles relative to the direction of the magnetic ed Upon which electron does the magnetic field exert the least force? (A)0 (B) 30° (C)60 (D) 90 field 7. An electron in an electric field experiences a force of 1 1 direction of the field. What is the magnitude of the electric field? (A) 1.6x 103 N/C (B)1.6x 10*/C (c) 6.3 x 10* N/c D). x 10* N opposite the 6.3x 1025 N/C 8. A 1uF capacitor has plates that are 0.2 mm apart. There is only between the plates. What is the area of the plates? (A) 023 ㎡ (B) 2.3 ㎡ (C) 23m2 (D) 230 ㎡

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CONCEPT : Calculation of magnetic force acting on moving in a magnetic field region

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