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NEET-XII-Physics

32: Electric Current in Conductors

with Solutions - page 6
Qstn# iv-25-a Prvs-QstnNext-Qstn
  • #25-a
    all the bulbs are switched on, (b) two of the bulbs are switched on and (c) only one bulb is switched on.
    Ans : When all the bulbs are switched on, we have a combination of three bulbs in parallel.
    The effective resistance of the circuit,
    `` {R}_{\,\mathrm{\,eff\,}}=\frac{180}{3}=60\,\mathrm{\,\Omega \,}``
    `` ``
    The current delivered by the battery,
    `` i=\frac{60}{60}=1\,\mathrm{\,A\,}`` (b) When two of the bulbs are switched on, they are parallel to each other.
    The effective resistance of the circuit,
    `` {R}_{\,\mathrm{\,eff\,}}=\frac{180}{2}=90\,\mathrm{\,\Omega \,}``
    The current delivered by the battery,
    `` i=\frac{60}{90}=0.67\,\mathrm{\,A\,}`` (c) When only one bulb is switched on, the effective resistance of the circuit,
    `` {R}_{\,\mathrm{\,eff\,}}=180\,\mathrm{\,\Omega \,}``
    `` ``
    The current delivered by the battery,
    `` i=\frac{60}{180}=0.33\,\mathrm{\,A\,}``
    Page No 199:
  • #25-b
    two of the bulbs are switched on and
    Ans : When two of the bulbs are switched on, they are parallel to each other.
    The effective resistance of the circuit,
    `` {R}_{\,\mathrm{\,eff\,}}=\frac{180}{2}=90\,\mathrm{\,\Omega \,}``
    The current delivered by the battery,
    `` i=\frac{60}{90}=0.67\,\mathrm{\,A\,}``
  • #25-c
    only one bulb is switched on.
    Ans : When only one bulb is switched on, the effective resistance of the circuit,
    `` {R}_{\,\mathrm{\,eff\,}}=180\,\mathrm{\,\Omega \,}``
    `` ``
    The current delivered by the battery,
    `` i=\frac{60}{180}=0.33\,\mathrm{\,A\,}``
    Page No 199: