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1.

Figure shows the electric lines of forces emerging from a charged body. If the electric field at A and B are E_{A} and E_{B} respectively and if the displacement between A and B is r, then

E

_{A}> E_{B}E

_{A}< E_{B}E

_{A}= E_{B}/rE

_{A}= E_{B }/ r^{2}

2.

A small piece of metal wire is dragged across the gap between the pole pieces of a magnet in 0.4 sec. If magnetic flux between the pole pieces is known to be 8 × 10^{-4} Wb, then induced emf in the wire, is

4 × 10

^{-3}V8 × 10

^{-3}V^{ }20 × 10

^{-3}V6 × 10

^{-3}V

3.

$\frac{\mathrm{Q}}{{\mathrm{\epsilon}}_{\mathrm{o}}}$

$\frac{\mathrm{Q}}{6{\mathrm{\epsilon}}_{\mathrm{o}}}$

$\frac{\mathrm{Q}}{6{\mathrm{\epsilon}}_{\mathrm{o}}}$

$\frac{\mathrm{Q}}{{\mathrm{\epsilon}}_{\mathrm{o}}{\mathrm{a}}^{2}}$

$\frac{\mathrm{Q}}{4{\mathrm{\pi \epsilon}}_{\mathrm{o}}{\mathrm{a}}^{2}}$

4.

The unit of permittivity (${\mathrm{\epsilon}}_{0}$) of space is

newton-metre

^{2 }/ coulomb^{2}coulomb / newton-metre

coulomb / newton-metre

^{2}coulomb

^{2 }/ newton-metre^{2}

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5.

Two charges each of equal magnitude 3.2 x 10^{-19} coulomb but of opposite sign form an electric dipole. The distance between the two charges is 2.4 $\stackrel{\circ}{\mathrm{A}}$. If the dipole is placed in an electric field of 5 x 10^{5} volt/metre, then in equilibrium its potential energy will be

3 × 15

^{-23}joule-3.84 × 10

^{-23}joule-6 × 10

^{-23}joule-2 × 10

^{-26}joule

7.

An electron is moving with velocity v on a circular path of radius r in a transverse electric field B. The specific charge (e/m) of the electron is

Bvr

$\frac{\mathrm{\nu}}{\mathrm{Br}}$

Bvr

^{2}$\frac{\mathrm{B}}{\mathrm{r\nu}}$

8.

Two spheres of same metal have radii a and b. Thet have been connected to a conducting wire. Find the ratio of the electric field intensity upon them.

a/b

b/a

b

^{2}/ ab

^{2}/a^{2}

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9.

Using mass (M), length (L), time (T ) and current (A) as fundamental quantities, the dimension of permeability is

[ M

^{-1}L T^{-2 }A ][ M L

^{2}T^{-2}A^{-1 }][ M L T

^{-2}A^{-2}][ M L T

^{-1 }A^{-1}]

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Length cannot be measure by

fermi

micron

debye

light year

C.

debye

A fermi is equivalent to a femtometer and it is older non-SI measurement unit of length.

A micron is a unit of measure in the system equal to 1 millionth of a meter in length ( about 39 millionths of an inch ).

The light-year is a unit of length used to express astronomical distances and measures about 9.46 trillion kilometers ( 9.46 × 10^{12} km )

Debye is the unit of electric dipole moment. Therefore length cannot be measured by debye.

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