Question 10: [10 pts (a) If the electric field in a plane electromagnetic wave i

Question

Question 10: [10 pts (a) If the electric field in a plane electromagnetic wave is given by E Sit Ensinl(3 x 10° mfl x)-a), the value or ? is: A) 0.01 rad/s C) 100 rad/s D) 9 x 10 rad/s E) 9x1016 rad's (b) If the amplitude of the electric field in a plane electromagnetic wave is 100 V/m then the amplitude of the magnetic field is: A) 3.3 × 10-7 T B) 6.7x10"T C 0.27 T D) 8.0 x 10'T Ouestion11 [Sptsj: The diagrams show five possible orientations of a magnetie dipole ? in a uniform magnetic field B. For which of these does the magnetic torque on the dipole have the greatest magnitude? A) I B) II D) IW

Explanation / Answer

The relation between angualr frequency and wave number is

w = kc

= 3* 10^6 (3* 10^8)

= 9 * 10^14 rad/s

option (D) is correct answer

(2)

B max = E max/c

= 100/3 * 10^8

=33.33 * 10^-8 T

(3)

relation between torque and magnetic field

T = uXB= uB sin theta

when theta = 90 degree, T is maximum

in the first case theta = 90 so torque is maxxium in this case

option (A) is correct answer

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