Two capacitors each of capacitance `5muF` and a battery of emf 240 volt. Which arrangement, series or parallel, would give minimum energy? Calculate its value.

A capacitor of 100 muF, a coil of resistance 50 Omega and an inductance 0.5 H are connected in series with a 110 V-50 HZ source. Calculate the mis value of current in the circuit.

Net capacitance of three identical capacitors in series is 1muF . What will be their net capacitance if connected in parallel? Find the ratio of energy stored in the two configurations, if they are both connected to the same source.

Net capacitance of three identical capacitors in series is 1muF . What will be their net capacitance in parallel? Find the ratio of energy stored in two configuration if they are connected to the same source.

A parallel plate air capacitor has a capacitance of 4muF . A slab of dielectric constant 4 and thickness 4 cm completely fills the space between the plates. The potential difference between the plates is maintained constant at 200 volt. What is the change in the energy of a capacitor if the slab is removed?

Keeping the source frequency equal to the resonating frequency of the series LCR circuit, if the three elements,L , C and R are arranged in parallel,show that the total current in the parallel LCR circuit is minimum at this frequency. Obtain the current rms value in each branch of the circuit for the elements of frequency . Source has emf 230 V and L = 5.0 H , C = 80 mu F and R = 40 Omega .

Find the ratio of the potential difference that must be applied across the parallel and series combination of two capacitors C_1 and C_2 with capacitance in the ratio 1:2 , so that the energy stored in these two cases becomes the same.

A set of 'n' equal resistor, of value of 'R' each are connected in series to a battery of emf 'E' and internal resistance 'R' . The current drawn is I . Now, the 'n' resistors are connected in parallel to the same battery. Then the current drawn from battery becomes 10 I. The value of 'n' is

Two plates of a parallel plate capacitor are 4 mm apart. A slab of dielectric constant 3 and thickness 3mm is introduced between the plates with the faces parallel to them. The distance between the faces is so adjusted that the capacitance of the capacitor becomes 2/3 of its original value. What is the new distance between the plates ?

The value of mutual inductance of two coils is B 10 mH. If the current in one of the coil changes from 5A to 1A in 0.2 s, calculate the value of emf induced in the other coil. Also calculate the value of induced charge passing through thecoil if its resistance is 5 ohm.

A potentiometer wire has a length 10 m and a resistance 20 Omega . Its terminals are connected to a battery of e.m.f. 4 V and internal resistance 5 Omega . What are the distances at which null points are obtained when two cells of e.m.f.s 1.5 V and 1.3 V are connected so as to oppose each other ?