19) to one another and perpendicular to the dinection of wave propagation parali

Question

19) to one another and perpendicular to the dinection of wave propagation paraliled to the direction of wave propagation 19 In an electroma gretic wave in free space, the electric and magnetic wave in free space, the electric and magnetic Belds are A) perpendicular to one anod S) paralled to one another and C) paralkel to one another and perpendicular to the di D) perpendicular to one rection c pendicular boom another and parallel to the direction ol wave propagation of the following statements about electromagnetic waves in free space are true? (mere is A) The electric field vector is always at parallel to the magnetic field vector 20) Which of the following statements about electromagnetie waves only one correct choice.) B) The wavelerngths of the visible waves are some of the shortest electromagnetic waves C) The wavelengths of the visible waves are some of the longest electromagnetic waves D) The higher-frequency travel faster than the lower-frequency waves E) The higher-frequency waves have shorter wavelengths than the lower-frequency waves field of 21) 21) An electron moves with a speed of 5.0 10t m's perpendicular to a uniform magretic magnitude 0.20T. What is the magnitude of the magnetic force on the electron A) 1.6 10-15N B) zero 26 10-24 N D) 4.4 10-14N E) S 10-20 N 22) A 2.0-m straight wire carrying a current of 0.60 A is oriented parallel to a uniform magnetic field 22) of 0.50 T. What is the magnitude of the magnetie force on it A) 060N B) zero C) 0.15 N D) 0.30 N 23) How much current must flow through a kong straight wire for the magnetic field strength to be 1.0 23) mT at 1.0 cm from a wire? A) 50 A B) 50 mA C) 16 A D) 9.2 A E) 5.0 mA 24) A flat circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the 24 magnetic lux through the loop when the plane of the loop and the magnetic field vector are parallel. A) 6.3. 10-3T m2 C)5.5 10-3T.m2 B)OT.m2 D) 3.1 10-3T-m2 25 25) A flat coil is wrapped with 200 turns of very thin wire on a square frame with sides 18 cm long. A 25) uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0.00 T in 8.0 s, find the emf induced in the coil. A) 041 V B) 4.1 mV C) 21 mw D) 0.21 V amps at 24 V can D) 23 A 26) When 5.0 A at 110 V flows in the primary of an ideal transformer, how many 26) flow in the secondary? A) 5.0 A B) 4.6 A C) 1.1A 27) What is the wavelength used by a radio station that broadcasts at a frequency of 920 kHz? 27) A) 22.6 m B) 175 m C) 226 m D) 326 m E) 276 m

Explanation / Answer

19) A

20)E

21)1.6*10^-15 N

22)0.6 N( F=BIL)

23) D

24) 6.3 *10^-3 Wb

25)A

26)1.1 A

27)326m

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