1
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
A fully charged capacitor $$C$$ with initial charge $${q_0}$$ is connected to a coil of self inductance $$L$$ at $$t=0.$$ The time at which the energy is stored equally between the electric and the magnetic fields is :
A
$${\pi \over 4}\sqrt {LC} $$
B
$$2\pi \sqrt {LC} $$
C
$$\sqrt {LC} $$
D
$$\pi \sqrt {LC} $$
2
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
A boat is moving due east in a region where the earth's magnetic fields is $$5.0 \times {10^{ - 5}}$$ $$N{A^{ - 1}}\,{m^{ - 1}}$$ due north and horizontal. The best carries a vertical aerial $$2$$ $$m$$ long. If the speed of the boat is $$1.50\,m{s^{ - 1}},$$ the magnitude of the induced $$emf$$ in the wire of aerial is :
A
$$0.75$$ $$mV$$
B
$$0.50$$ $$mV$$
C
$$0.15$$ $$mV$$
D
$$1$$ $$mV$$
3
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
A resistor $$'R'$$ and $$2\mu F$$ capacitor in series is connected through a switch to $$200$$ $$V$$ direct supply. Across the capacitor is a neon bulb that lights up at $$120$$ $$V.$$ Calculate the value of $$R$$ to make the bulb light up $$5$$ $$s$$ after the switch has been closed. $$\left( {{{\log }_{10}}2.5 = 0.4} \right)$$
A
$$1.7 \times {10^5}\,\Omega $$
B
$$2.7 \times {10^6}\,\Omega $$
C
$$3.3 \times {10^7}\,\Omega $$
D
$$1.3 \times {10^4}\,\Omega $$
4
AIEEE 2010
MCQ (Single Correct Answer)
+4
-1
In a series $$LCR$$ circuit $$R = 200\Omega $$ and the voltage and the frequency of the main supply is $$220V$$ and $$50$$ $$Hz$$ respectively. On taking out the capacitance from the circuit the current lags behind the voltage by $${30^ \circ }.$$ On taking out the inductor from the circuit the current leads the voltage by $${30^ \circ }.$$ The power dissipated in the $$LCR$$ circuit is
A
$$305$$ $$W$$
B
$$210$$ $$W$$
C
$$zero$$ $$W$$
D
$$242$$ $$W$$
JEE Main Subjects
EXAM MAP
Joint Entrance Examination
JEE MainJEE AdvancedWB JEEBITSAT
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN