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 :
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
3
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
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
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