1
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
A potentiometer wire of length L and a resistance r are connected in series with a battery of e.m.f. E0 and a resistance r1. An unknown e.m.f. E is balanced at a length $$l$$ of the potentiometer wire. The e.m.f. E will be given by
A
$${{{E_0}l} \over L}$$
B
$${{L{E_0}r} \over {\left( {r + {r_1}} \right)l}}$$
C
$${{L{E_0}r} \over {l{r_1}}}$$
D
$${{{E_0}r} \over {\left( {r + {r_1}} \right)}}.{l \over L}$$
2
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
A proton and an alpha particle both enter a region of uniform magnetic field B, moving at right angles to the field B. If the radius of circular orbits for both the particles is equal and the kinetic energy acquired by proton is 1 MeV, the energy acquired by the alpha particle will be
A
1.5 MeV
B
1 MeV
C
4 MeV
D
0.5 MeV
3
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
A rectangular coil of length 0.12 m and width 0.1 m having 50 turns of wire is suspended vertically in a uniform magnetic field of strength 0.2 weber/m2. The coil carries a current of 2 A. If the plane of the coil is inclined at an angle of 30o with the direction of the field, the torque required to keep the coil in stable equilibrium will be
A
0.24 Nm
B
0.12 Nm
C
0.15 Nm
D
0.20 Nm
4
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
A series R-C circuit is connected to an alternating voltage source. Consider two situations :
(a)  When capacitor is air filled.
(b)  When capacitor is mica filled.
Current through resistor is $$I$$ and voltage across capacitor is $$V$$ then
A
$${i_a} > {i_b}$$
B
$${V_a} = {V_b}$$
C
$${V_a} < {V_b}$$
D
$${V_a} > {V_b}$$
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