Question
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A closed, circular loop has a counter-clockwise current flowing through It as viewed by a person on ihc right, as shown in the figure, (fa second closed circular loop with the same radius approaches this loop with constant velocity along a common axis as shown, in what direction will a current flow in the approaching loop as viewed by the person on the right? clockwise counter-clockwise No current will be induced because the velocity of approach is constant A uniform magnetic field is applied perpendicular to the plane ofa60-iurn circular coil with a radius of 6.0 cm and a resistance of 0.60 ohm. If the magnetic field increases uniformly from 0.20 T to 1.8 Tin 0.20 s. what Is the magnitude of the emf induced in the coil? (Remember that if a single coil has an emf induced, an N-turn coil has an emf N*epsilon Induced). 7.2 V 5.4 9.2 V 12 V 16 V An electromagnetic wave propagates along the +y direction as shown in the figure. If the electric field at the origin is along +z direction, what is the direction of the magnetic field? +z -z +y +x -x The y component of the electric field of an electromagnetic wave traveling in the +x direction through vaccum obeys the equation Ey = (375 N/C) sin[kx- (1.10 times 10 -14 rad/s)t]. What is the wavelength of this electromagnetic wave? (e = 3.0 times 10 8 m/s) 0.544 mum 2.72 mum 5.44 mum 17.1 mum 34.3 mum Unpolarized light passes through three polarizing fillers. The first one is oriented with a horizontal transmission axis, the second filler has its transmission axis 35.5 degree from the horizontal and the third one has a vertical transmission axis. What percent of the light gets through this combination of filters? 11.2% 88.8% 77.6% 0.00% 22.4% For a fixed amount of gas at a fixed volume, if the absolute temperature of the gas is doubled, what happens to the pressure of the gas? The pressure of the gas becomes double the original pressure. The pressure of the gas becomes eight times (he original pressure. The pressure of the gas becomes one half the original pressure. The pressure of the gas becomes four times the original pressure. An ideal gas is at a pressure 1.00 times 10 5 N/m2 and occupies a volume 2.00 m3. If the gas is compressed to a volume 1.00 m3 while the temperature remains constant, what will be the new pressure in the gas (assume the number of molecules remains constant as well)? 0.500 times 105N/m2 4.00 times 105 N/m2 1.00 times 105 N/m2 2.00 times 105 N/m2
Explanation / Answer
1. E vertically upwards--actually magnetic field around a current carrying wire is n circular motion around it. it means at anu point it will be tangential
2. frequency f = qB/2pi m = 2.1 *10^10 Hz====== option A
3. mg = iLB =============. i = 4.9 A ===== option C
4. B = B1+B2 = U0I1/2pi)*(1/0.2 +1/0.4) = 1.5 uT ------ option A
5. option C
6. option E
7. optonA ----clockwise
8. induced emf e = NAdB/dt /R = 9.2 V opton c
