1
JEE Main 2019 (Online) 11th January Morning Slot
+4
-1
Two equal resistances when connected in series to a battery, consume electric power of 60 W. If these resistances are now connected in parallel combination to the same battery, the electric power consumed will be :
A
240 W
B
60 W
C
30 W
D
120 W
2
JEE Main 2019 (Online) 11th January Morning Slot
+4
-1
The given graph shows variation (with distance r form centre) of :

A
Electric field of a uniformly charged sphere
B
Electric field of a uniformly charged spherical shell
C
Potential of a uniformly charged sphere
D
Potential of a uniformly charged spherical shell
3
JEE Main 2019 (Online) 11th January Morning Slot
+4
-1
The resistance of the meter bridge AB in given figure is 4 $$\Omega$$. With a cell of emf $$\varepsilon$$ = 0.5 V and rheostat resistance Rh = 2 $$\Omega$$ the null point is obtained at some point J. When the cell is replaced by another one of emf $$\varepsilon$$ = $$\varepsilon$$2 the same null point J is found for Rh = 6 $$\Omega$$. The emf $$\varepsilon$$2 is, :

A
0.3 V
B
0.6 V
C
0.5 V
D
0.4 V
4
JEE Main 2019 (Online) 11th January Morning Slot
+4
-1
In the circuit shown,

the switch S1 is closed at time t = 0 and the switch S2 is kept open. At some later time(t0), the switch S1 is opened and S2 is closed. The behavior of the current I as a function of time 't' is given by :
A
B
C
D
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