1
JEE Main 2018 (Offline)
+4
-1
In an a.c. circuit, the instantaneous e.m.f. and current are given by
e = 100 sin 30 t
i = 20 sin $$\left( {30t - {\pi \over 4}} \right)$$
In one cycle of a.c., the average power consumed by the circuit and the wattless current are, respectively
A
50, 0
B
50, 10
C
$${{1000} \over {\sqrt 2 }},10$$
D
$${{50} \over {\sqrt 2 }}$$
2
JEE Main 2018 (Offline)
+4
-1
Out of Syllabus
For an RLC circuit driven with voltage of amplitude vm and frequency $${\omega _0}$$ = $${1 \over {\sqrt {LC} }}$$ the current exhibits resonance. The quality factor, Q is given by :
A
$${{CR} \over {{\omega _0}}}$$
B
$${{{\omega _0}L} \over R}$$
C
$${{{\omega _0}R} \over L}$$
D
$${R \over {\left( {{\omega _0}C} \right)}}$$
3
JEE Main 2018 (Online) 15th April Morning Slot
+4
-1 An ideal capacitor of capacitance $$0.2\,\mu F$$ is charged to a potential difference of $$10$$ $$V.$$ The charging battery is then disconnected. The capacitor is then connected to an ideal inductor of self inductance $$0.5$$ $$mH.$$ The current at a time when the potential difference across the capacitor is $$5$$ $$V,$$ is :
A
$$0.34\,\,A$$
B
$$0.25\,\,A$$
C
$$0.17\,\,A$$
D
$$0.15\,\,A$$
4
JEE Main 2017 (Online) 9th April Morning Slot
+4
-1
A sinusoidal voltage of peak value 283 V and angular frequency 320/s is applied to a series LCR circuit. Given that R=5 $$\Omega$$, L=25 mH and C=1000 $$\mu$$F. The total impedance, and phase difference between the voltage across the source and the current will respectively be :
A
10 $$\Omega$$ and tan$$-$$1 $$\left( {{5 \over 3}} \right)$$
B
$$7\,\Omega$$ and 45o
C
$$10\,\Omega$$ and tan$$-$$1$$\left( {{8 \over 3}} \right)$$
D
$$7\,\Omega$$ and tan$$-$$1$$\left( {{5 \over 3}} \right)$$
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Physics
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Modern Physics
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