NEET UG 2006 — Electromagnetism

A coil of inductive reactance $31 \Omega$ has a resistance of $8 \Omega$. It is placed in series with a condenser of capacitative reactance $25 \Omega$. The combination is connected to an a.c. source of $110 \mathrm{~V}$. The power factor of the circuit is:

A parallel plate air capacitor is charged to a potential difference of $V$ volts. After disconnecting the charging battery the distance between the plates of the capacitor is increased using an insulating handle. As a result the potential difference between the plates:

A square surface of side $L$ metres is in the plane of the paper. A uniform electric field $\vec{E}$ (volt $/ \mathrm{m})$, also in the plane of the paper, is limited only to the lower half of the square surface (see figure). The electric flux in SI units associated with the surface is: 

Above curie temperature:

An electric dipole of moment $\vec{p}$ is lying along a uniform electric field $\vec{E}$. The work done in rotating the dipole by rotating the dipole by 90 degrees:

In producing chlorine through electrolysis 100 watt power at $125 \mathrm{~V}$ is being consumed. How much chlorine per minute is liberated ? E. C. E. of chlorine is $0.367 \times 10^{-6} \mathrm{~kg} /$ coulomb:

In the circuit shown, if a conducting wire is connected between points $\mathrm{A}$ and $\mathrm{B}$, the current in this wire will: 

Kirchhoff's first and second laws of electrical circuits are consequences of:

Power dissipated across the $8 \Omega$ resistor in the circuit shown here is 2 watt. The power dissipated in watt units across the $3 \Omega$ resistor is: 

The core of a transformer is laminated because:

Two cells, having the same e.m.f. are connected in series through an external resistance $R$. Cells have internal resistances $r_1$ and $r_2\left(r_1>r_2\right)$ respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of $R$ is:

Two circular coils 1 and 2 are made from the same wire but the radius of the $1^{\text {st }}$ coil is twice that of the $2^{\text {nd }}$ coil. What potential difference in volts should be applied across them so that the magnetic field at their centres is the same?

Two coils of self inductance $2 \mathrm{mH}$ and 8 $\mathrm{mH}$ are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is:

When a charged particle moving with velocity $\vec{v}$ is subjected to a magnetic field of induction $\vec{B}$, the force on it is non-zero. This implies that: