1
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Ionized hydrogen atoms and $$\alpha $$-particles with same momenta enters perpendicular to a constant magnetic field, B. The ratio of their radii of their paths rH : r$$\alpha $$ will be :
A
1 : 2
B
4 : 1
C
1 : 4
D
2 : 1
2
NEET 2018
MCQ (Single Correct Answer)
+4
-1
A metallic rod of mass per unit length 0.5 kg m–1 is lying horizontally on a smooth inclined plane which makes an angle of 30° with the horizontal. The rod is not allowed to slide down by flowing a current through it when a magnetic field of induction 0.25 T is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is
A
7.14 A
B
5.98 A
C
14.76 A
D
11.32 A
3
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 $$\Omega $$
4
NEET 2017
MCQ (Single Correct Answer)
+4
-1
An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current $$'I'$$ along the same direction as shown in fogure. Magnitude of force per unit length on the middle wire $$'B'$$ is given by

NEET 2017 Physics - Moving Charges and Magnetism Question 70 English
A
$${{2{\mu _0}{I^2}} \over {\pi d}}$$
B
$${{\sqrt 2 {\mu _0}{I^2}} \over {\pi d}}$$
C
$${{{\mu _0}{I^2}} \over {\sqrt 2 \pi d}}$$
D
$${{{\mu _0}{I^2}} \over {2\pi d}}$$
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