MHT CET 2021 22th September Evening Shift | Alternating Current Question 46 | Physics

A parallel plate capacitor having plates of radius 6 cm has capacitance 100 pF. It is connected to 230 V a.c. supply with angular frequency 300 rad/s. The r.m.s. value of current is

$$6.9\times10^{-6}$$ A

$$2.3\times10^{-5}$$ A

$$6.9\times10^{-5}$$ A

$$6.9\times10^{-7}$$ A

MHT CET 2021 22th September Evening Shift

MCQ (Single Correct Answer)

-0

A step down transformer has turns ratio $$20: 1$$. If $$8 \mathrm{~V}$$ is applied across $$0.4 \mathrm{~ohm}$$ secondary then the primary current will be

2 A

1 A

0.5 A

4 A

MHT CET 2021 21th September Evening Shift

MCQ (Single Correct Answer)

-0

In LCR series resonant circuit, at resonance, voltage across 'L' and 'C' will cancel each other because they are

90$$^\circ$$ out of phase

90$$^\circ$$ in phase

180$$^\circ$$ in phase

180$$^\circ$$ out of phase

MHT CET 2021 21th September Evening Shift

MCQ (Single Correct Answer)

-0

The inductive reactance of a coil is R$$\Omega$$. If the inductance of a coil is doubled and frequency of a.c. supply is also doubled then the new inductive reactance will be

$$\mathrm{\frac{R}{2}}$$

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