1
AIPMT 2011 Mains
+4
-1
A coil has resistance 30 ohm and inductive reactance 20 ohm at 50 Hz frequency. If an ac source, of 200 volt, 100 Hz, is connected across the coil, the current in the coil will be
A
2.0 A
B
4.0 A
C
8.0 A
D
$${{20} \over {\sqrt {13} }}A$$
2
AIPMT 2011 Prelims
+4
-1
In the ac circuit an alternating voltage e = $$200\sqrt 2$$sin100t volts is connected to a capacitor of capacity 1 $$\mu$$F. The r.m.s. value of the current in the circuit is
A
10 mA
B
100 mA
C
200 mA
D
20 mA
3
AIPMT 2011 Prelims
+4
-1
An ac voltage is applied to a resistance R and an inductor L in series. If R and the inductive reactance are both equal to 3 $$\Omega$$, the phase difference between the applied voltage and the current in the circuit is
A
$$\pi /6$$
B
$$\pi /4$$
C
$$\pi /2$$
D
zero
4
AIPMT 2010 Mains
+4
-1
A condenser of capacity C is charged to a potential difference of V1. The plates of th condenser are then connected to an ideal inductor of inductance L. The current through the inductor when the potential difference across the condenser reduces to V2 is
A
$${\left( {{{C{{\left( {{V_1} - {V_2}} \right)}^2}} \over L}} \right)^{{1 \over 2}}}$$
B
$${{C\left( {V_1^2 - V_2^2} \right)} \over L}$$
C
$${{C\left( {V_1^2 + V_2^2} \right)} \over L}$$
D
$${\left( {{{C\left( {V_1^2 - V_2^2} \right)} \over L}} \right)^{{1 \over 2}}}$$
EXAM MAP
Medical
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