1
JEE Main 2016 (Online) 9th April Morning Slot
+4
-1
Microwave oven acts on the principle of :
A
transferring electrons from lower to higher energy levels in water molecule
B
giving rotational energy to water molecules
C
giving vibrational energy to water molecules
D
giving translational energy to water molecules
2
JEE Main 2016 (Online) 9th April Morning Slot
+4
-1
A series LR circuit is connected to a voltage source with
V(t) = V0 sin$$\Omega$$t. After very large time, current I(t) behaves as
(t0 >> $${L \over R}$$) :
A
B
C
D
3
JEE Main 2016 (Offline)
+4
-1
An arc lamp requires a direct current of 10 A at 80 V to function. If it is connected to a 220 V (rms), 50 Hz AC supply, the series inductor needed for it to work is close to :
A
0.044 H
B
0.065 H
C
80 H
D
0.08 H
4
JEE Main 2015 (Offline)
+4
-1
Two coaxial solenoids of different radius carry current $$I$$ in the same direction. $$\overrightarrow {{F_1}}$$ be the magnetic force on the inner solenoid due to the outer one and $$\overrightarrow {{F_2}}$$ be the magnetic force on the outer solenoid due to the inner one. Then :
A
$$\overrightarrow {{F_1}}$$ is radially in wards and $$\overrightarrow {{F_2}} = 0$$
B
$$\overrightarrow {{F_1}}$$ is radially outwards and $$\overrightarrow {{F_2}} = 0$$
C
$$\overrightarrow {{F_1}} = \overrightarrow {{F_2}} = 0$$
D
$$\overrightarrow {{F_1}}$$ is radially inwards and $$\overrightarrow {{F_2}}$$ is radially outards
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