1
AIPMT 2015 Cancelled Paper
MCQ (Single Correct Answer)
+4
-1
Across a metallic conductor of non-uniform cross section a constant potential difference is applied. The quantity which remains constant along the conductor is
A
drift velocity
B
electric field
C
current density
D
current
2
AIPMT 2015 Cancelled Paper
MCQ (Single Correct Answer)
+4
-1
A, B and C are voltmeters of resistance R, 1.5 R and 3R respectively as shown in the figure. When some potential difference is applied between X and Y, the voltmeter readings are VA, VB and VC respectively, Then

AIPMT 2015 Cancelled Paper Physics - Current Electricity Question 91 English
A
VA = VB $$ \ne $$ VC
B
VA $$ \ne $$ VB $$ \ne $$ VC
C
VA = VB = VC
D
VA $$ \ne $$ VB = VC
3
AIPMT 2015 Cancelled Paper
MCQ (Single Correct Answer)
+4
-1
A potentiometer wire has length 4 m and resistance 8 $$\Omega $$. The resistance that must be connected in series with the wire and an accumulator of e.m.f. 2 V, so as to get a potential gradient 1 mV per cm on the wire is
A
44 $$\Omega $$
B
48 $$\Omega $$
C
32 $$\Omega $$
D
40 $$\Omega $$
4
AIPMT 2015 Cancelled Paper
MCQ (Single Correct Answer)
+4
-1
An electron moving in a circular orbit of radius r makes n rotations per second. The magnetic field produced at the centre has magnitude
A
$${{{\mu _0}{n^2}e} \over r}$$
B
$${{{\mu _0}ne} \over {2r}}$$
C
$${{{\mu _0}ne} \over {2\pi r}}$$
D
Zero
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