Questions
Four identical bulbs are connected to a battery as shown in the figure. After the switch S is closed,
a
Brightness of all bulbs will increase
b
Brightness of all bulbs will decrease
c
Brightness of all bulbs will remain unchanged
d
Brightness of B1 and B4 will increase and brightness of B2 and B3 will decrease.
detailed solution
Correct option is C
initially current through each bulb,i1=V2RAfter S is closed, equivalent resistance of the circuit, RC=R×RR+R+R×RR+R=RSo, current through each bulb, i2=12VR=V2R=i1Since brightness ∝i2 and i2=i1. brightness of the bulbs remains unchanged.Talk to our academic expert!
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Seven resistances are connected as shown in the figure. The equivalent resistance between A and B is
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