Electric Circuits Answers

How would you determine whether the charge on a particular rod is positive or negative?

The P.D.across the resistor is 160V and that of across the inductor is 120V .Find the effective value of the applied voltage.When these are connected across an a.c.source. If the effective current in the circuit be 1A calculate the impedance.

Two electrically neutral spheres are separated by 1.0 cm. Electrons are removed from one sphere and transferred to the other until a force of magnitude 1.0 × 10−6 N is generated between the two spheres. How many electrons were transferred in the process? Choose the correct answer.

Copper has a resistivity of Ω m. A wire of diameter 1.5 mm and length 25 m is connected across a potential difference of 50 V.

Calculate:

(a) The resistance of the wire

(b) The current

(c) The power dissipated in the wire

A 2.0 µF capacitor is charged to 12 V. The voltage supply is removed and then a 4.0 µF capacitor is fitted in parallel with the 2.0 µF one. Calculate the charge stored in the 2.0 µF capacitor finally.

When a LR circuit with L=3mH is connected in series to an AC source of rms voltage 30V a maximum RMS current of 6A is observed at frequency (500/π)Hz. If LR circuit is now connected to a battery of emf 21V And internal resistance of 3ohm the current will be
Ans 3A

A positively charged rod attracts a small piece of cork.a) Can we conclude that the cork is negatively charged?b)The rod repels another small piece of cork. Can we conclude that this piece is positively charged?

A current of 1000 MA passes through a conductor for 2minute. Calculate quantity of electricity transfered

Derive the expression for the energy stored by a capacitor of charge Q potential difference between the plate of V and capacitance.