1
NEET 2018
MCQ (Single Correct Answer)
+4
-1
The magnetic potential energy stored in a certain inductor is 25 mJ, when the current in the inductor is 60 mA. This inductor is of inductance
A
0.138 H
B
138.88 H
C
1.389 H
D
13.89 H
2
NEET 2018
MCQ (Single Correct Answer)
+4
-1
Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is
A
40 $$\Omega $$
B
25 $$\Omega $$
C
250 $$\Omega $$
D
500 $$\Omega $$
3
NEET 2018
MCQ (Single Correct Answer)
+4
-1
An EM wave is propagating in a medium with a velocity $$\overrightarrow v = v\widehat i$$. The instantaneous oscillating electric field of this em wave is along +y axis. Then the direction of oscillating magnetic field of the em wave will be along
A
z direction
B
+z direction
C
–y direction
D
–x direction
4
NEET 2018
MCQ (Single Correct Answer)
+4
-1
The refractive index of the material of a prism is $$\sqrt 2 $$ and the angle of the prism is 30°. One of the two refracting surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if its angle of incidence on the prism is
A
600
B
450
C
300
D
zero
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