# 9 - Alternating Current Questions Answers

**Asked By: AYUSH PAINE**

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**Joshi sir comment**

${X}_{C}=50\Omega and{X}_{L}=100\Omega areinparallel.\phantom{\rule{0ex}{0ex}}Resul\mathrm{tan}tis100\Omega capaci\mathrm{tan}ce.\phantom{\rule{0ex}{0ex}}Now100\Omega capaci\mathrm{tan}ceand100\Omega induc\mathrm{tan}cegivereac\mathrm{tan}ce0\Omega \phantom{\rule{0ex}{0ex}}andresis\mathrm{tan}ceis100\Omega .SoonlyoptionDiscorrect.$

is impedence as same as resistanace in a circuit // and // are capacitive reactance and inductive reactance constant values(i.e. independant of value of current in ac circuit at any time) ??

**Asked By: AAYUSH TANEJA**

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**Joshi sir comment**

Write the question with correct symbols

yes it is equivalent to resistance for that circuit

chock coil is used to

1) increase current

2) increase voltage

3) decrease current

4) decrease voltage

here we know power= IV & chock coil is used to reduce the power loss , so here what vyl be the answer

**Asked By: SARIKA SHARMA**

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**Joshi sir comment**

chock coil in ac is the device equivalent to rheostat in dc, so it is used to increase current.

can you give me an idea of solving the parallel LC circuit? Also to find the phase difference between the I and E?

**Asked By: NIKHIL VARSHNEY**

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**Joshi sir comment**

1st make a 3 line circuit in which ac source, resistor with an inductor and resistor with a capacitor will be there in the three lines then divide total current "I"

from AC into the two legs, equations will be

**e = L di _{1}/dt + i_{1}R (1)**

**e =q _{2 }/ C + i_{2} R (2) here dq_{2} / dt = i_{2}**

now solve

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