1
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
A parallel plate air capacitor has capacity C, distance of separation between plates is d and potential difference $$V$$ is applied between the plates. Force of attraction between the plates of the parallel plate air capacitor is
A
$${{C{V^2}} \over d}$$
B
$${{{C^2}{V^2}} \over {2{d^2}}}$$
C
$${{{C^2}{V^2}} \over {2d}}$$
D
$${{C{V^2}} \over {2d}}$$
2
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
If potential (in volts) in a region is expressed as V(x, y, z) = 6xy $$-$$ y + 2yz, the electric field (in N/C) at point (1, 1, 0) is
A
$$ - \left( {2\widehat i + 3\widehat j + \widehat k} \right)$$
B
$$ - \left( {6\widehat i + 9\widehat j + \widehat k} \right)$$
C
$$ - \left( {3\widehat i + 5\widehat j + 3\widehat k} \right)$$
D
$$ - \left( {6\widehat i + 5\widehat j + 2\widehat k} \right)$$
3
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Two metal wires of identical dimensions are connected in series. If $$\sigma $$1 and $$\sigma $$2 are the conductivity of the combination is
A
$${{{\sigma _1} + {\sigma _2}} \over {{\sigma _1}{\sigma _2}}}$$
B
$${{{\sigma _1}{\sigma _2}} \over {{\sigma _1} + {\sigma _2}}}$$
C
$${{2{\sigma _1}{\sigma _2}} \over {{\sigma _1} + {\sigma _2}}}$$
D
$${{{\sigma _1} + {\sigma _2}} \over {2{\sigma _1}{\sigma _2}}}$$
4
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
A circuit contains an ammeter, a battery of 30 V and a resistance 40.8 ohm all connected in series. If the ammeter has a coil of resistance 480 ohm and a shunt of 20 ohm, the reading in the ammeter will be
A
2A
B
1A
C
0.5 A
D
0.25 A
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