Two parallel wires in free space are 10 cm apart and carry currents of 10 A in o

Question

Two parallel wires in free space are 10 cm apart and carry currents of 10 A in opposite directions. The two wires will a. attract each other b. repel each other Faraday's law of induction states that the emf induced in a loop of wire is proportional to a. the magnetic flux b. the magnetic flux times the loop's area c. the time variation of the magnetic flux d. current divided by time A magnetic flux of 4 times 10^-5 T-m^2 is maintained at a constant value through a coil of radius 0.3 m for 0.5 s. According to Faraday's law, the emf induced in the coil by this flux is a. Zero b. 8 times 10^-5 V c. 12 times 10^-5 V d. 2 times 10^-5 V "An induced current has a direction such that the magnetic field due to the current opposes the change in the magnetic field that induces the current'' is a statement of a. Ampere's law b. Faraday's law c. the Biot and Savart law d. Lenz's law The magnetic flux through a circular loop increases according to the relation Theta_B = 60 t^2 + 7.0 t, where Theta_B is in webers and t is in seconds. What is the magnitude of the emf induced in the loop when t = 3 sec? a. 28 V b. 54 V c. 43 V d. 75 V A 100 cm long conducting rod moves at a speed of 40 cm/s in a plane perpendicular to a uniform magnetic field of magnitude 0.4 T. What is the induced emf in the rod? a. 0, 016 V b. 0.16 V c. 1.60 V d. 16 V Radio waves of wavelength 3cm have a frequency of a. 1 MHz b. 9 MHz c. 100 MHZ d. 10,000 MHZ. According to the theory of light, the speed of light in liquids is a. less than the speed in free space b. greater than the speed in free space c. the same as the speed in free space d. zero A clear sheet of polaroid is placed on top of a similar sheet so that their polarizing axes make an angle of 30 degree with each other. The ratio of the intensity of emerging light to incident unpolarized light is a. 0.25 b. 0.33 c. 0.75 d. 0.375 A beam of light, traveling in air, strikes a plate of a transparent material at an angle of incidence of 56 degree. It is observed that the reflected and refracted beams form an angle of 90 degree. What is the index of refraction of the material? a. 1.40 b. 1.35 c. 1.50 d. 1.48

Explanation / Answer

9)repel each other

10)option C

11)0 ...constant flux cant induce e.m.f

12)option D .....lenz law

13)43volts

14)0.16 volts. Emf e=Blv

15)option D. C=lemda*frequency

16)a

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