1
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
Change Language
A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by 60o is W. Now the torque required to keep the magnet in this new position is
A
$${W \over {\sqrt 3 }}$$
B
$$\sqrt 3 W$$
C
$${{\sqrt 3 W} \over 2}$$
D
$${{2W} \over {\sqrt 3 }}$$
2
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following combinations should be selected for better tuning of an L-C-R circuit used for combination ?
A
R = 20 $$\Omega $$, L = 1.5 H, C = 35 $$\mu $$F
B
R = 25 $$\Omega $$, L = 2.5 H, C = 45 $$\mu $$F
C
R = 15 $$\Omega $$, L = 3.5 H, C = 30 $$\mu $$F
D
R = 25 $$\Omega $$, L = 1.5 H, C = 45 $$\mu $$F
3
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
Change Language
A uniform magnetic field is restricted within a region of rafius r. The magnetic field changes with time at a rate $${{d\overrightarrow B } \over {dt}}$$. Loop 1 of radius R > r encloses the region r and loop 2 of radius R is outside the region of magnetic field as shown in the figure. Then the e.m.f. generated is

NEET 2016 Phase 2 Physics - Electromagnetic Induction Question 26 English
A
zero in loop 1 and zero in loop 2
B
$$ - {{d\overrightarrow B } \over {dt}}\pi {r^2}$$ in loop 1 and $$ - {{d\overrightarrow B } \over {dt}}\pi {r^2}$$ in loop 2
C
$$ - {{d\overrightarrow B } \over {dt}}\pi {R^2}$$ in loop 1 and zero in loop 2
D
$$ - {{d\overrightarrow B } \over {dt}}\pi {r^2}$$ in loop 1 and zero in loop 2
4
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
Change Language
The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. The power factor of this circuit is
A
0.4
B
0.5
C
0.8
D
1.0
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