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NEET-XII-Physics

P1 year:2019

with Solutions - page 2
Qstn# 17 Prvs-QstnNext-Qstn
  • #17
    Six similar bulbs are connected as shown in
    the figure with a DC source of emf E and zero
    internal resistance.
    m1 png
    The ratio of power consumption by the bulbs
    when
    (i ) all are glowing and
    (ii) in the situation
    when two from section A and one from section
    B are glowing, will be :
    (1) 4 : 9
    (2) 9 : 4
    (3) 1 : 2
    (4) 2 : 1
    digAnsr:   2
    Ans : ( 2 )
    Sol. (i) All bulbs are glowing
    RR
    RR
    RR
    E
    = + =
    eq
    R R 2R
    R
    3 3 3
    = =
    2 2
    i
    eq
    E 3E
    Power (P) ...(1)
    R 2R
    (ii) Two from section A and one from section
    B are glowing.
    E
    R
    R
    R
    = + =
    eq
    R 3R
    R R
    2 2
    =
    2
    f
    2E
    Power (P ) ...(2)
    3R
    = =
    2
    i
    2
    f
    P 3E 3R
    9 : 4
    P 2R 2E