1
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
The power dissipated in the circuit shown in the figure is 30 watts. The value of R is
AIPMT 2012 Mains Physics - Current Electricity Question 75 English
A
20 $$\Omega $$
B
15 $$\Omega $$
C
10 $$\Omega $$
D
30 $$\Omega $$
2
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
A proton carrying 1 MeV kinetic energy is moving in a circular path of radius R in uniform magnetic field. What should be the energy of an $$\alpha $$-particle to describe a circle of same radius in the same field?
A
2 MeV
B
1 MeV
C
0.5 MeV
D
4 MeV
3
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
A magnetic needle suspended parallel to a magnetic field requires $$\sqrt 3 J$$ of work to turn it through 60o. The torque needed to maintain the needle in this position will be
A
$$2\sqrt 3 J$$
B
$$3$$ $$J$$
C
$$\sqrt 3 \,J$$
D
$${3 \over 2}\,J$$
4
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
The instantaneous values of alternating current and voltage in a circuit are given as

$$i = {1 \over {\sqrt 2 }}$$ sin (100 $$\pi $$t) ampere

$$e = {1 \over {\sqrt 2 }}\sin \left( {100\pi t + {\pi \over 3}} \right)$$ Volt

The average power in watts consumed in the circuit is
A
$${1 \over 4}$$
B
$${{\sqrt 3 } \over 4}$$
C
$${1 \over 2}$$
D
$${1 \over 8}$$
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