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12th Gujarat Board
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Which of the following is best insulator ?

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Important Questions on Sample Paper

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12th Gujarat Board
IMPORTANT
When a charged particle in motion enters into a uniform magnetic field perpendicularly then its
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12th Gujarat Board
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The network shown in figure is part of a complete circuit. If at a certain instant the current (I) is 5 A, and is decreasing at a rate of 103 A/s, then VB-VA is

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12th Gujarat Board
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200 V AC source is fed to series LCR circuit having XL=XC=50 Ω and R=25 Ω. Potential drop across the inductor is
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12th Gujarat Board
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A pure resistive circuit element X when connected to an AC supply of peak voltage 200 V gives a peak current of 5 A which is in phase with the voltage. A second circuit element Y, when connected to the same AC supply also gives the same value of peak current but the current lags behind by 90°. If the series combination of X and Y is connected to the same supply, what will be the RMS value of current?
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12th Gujarat Board
IMPORTANT
Match the column I with Column II and mark the appropriate choice.
  Column I   Column II
(A) Ferromagnetic (i)
(B) Ferrimagnetic (ii)
(C) Antiferromagnetic (iii)
(D) Diamagnetic (iv)
(E) Paramagnetic (v)
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12th Gujarat Board
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An AC voltage is applied to a resistor of resistance R and an inductor of inductance L in series. If R and the inductive reactance are both equal to 3 Ω, the phase difference between the applied voltage and the current in the circuit is
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12th Gujarat Board
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The phase difference between the alternating current and emf is π2. Which of the following cannot be the constituent of the circuit?
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12th Gujarat Board
IMPORTANT
An AC source is of 2002 V, 50 Hz. The value of voltage after 1600 s from the start is: