Electricity (Part-2)

41. __________ is defined as the force acting per unit current per unit length on a wire placed at right angles to the magnetic field. [S.S.C. Online CHSL (T-1) 27.01.2017 (Shift-II)]

(a) Magnetic susceptibility
(b) Magnetic flux density
(c) Magnetic flux
(d) Magnetic pulse

Correct Answer: (b) Magnetic flux density

Solution:The magnetic flux density is placed at right angles to the magnetic field. It is defined as the force acting per unit flow per length on a wire. It is a vector quantity. Its unit is Tesla.

$B = F$ / ILWhere:

$B$ is the magnetic flux density (in Tesla, T)
$F$ is the magnetic force on the wire (in Newton, N)
$I$ is the current flowing through the wire (in Ampere, A)
$L$ is the length of the wire within the magnetic field (in meter, m)

So, the statement directly defines magnetic flux density.

42. Weber per second is equivalent to_____ . [S.S.C. Online CGL (T-1) 18.08.2021 (Shift-II)]

(a) Volt
(b) Ohm
(c) Coulomb
(d) Ampere

Correct Answer: (a) Volt

Solution:Weber per second is equivalent to volt. The SI unit of magnetic flux is weber (Wb).

43. What is the unit of the physical quantity, Magnetic flux? [S.S.C. Online CHSL (T-1) 3.02.2017 (Shift-II)]

(a) Farad
(b) Tesla
(c) Weber
(d) Henry Tesla

Correct Answer: (c) Weber

Solution:The SI unit of the physical quantity magnetic flux is the Weber (Wb).

44. What is the unit of the physical quantity "Magnetic field strength"? [S.S.C. Online CHSL (T-1) 7.02.2017 (Shift-I)]

(a) Joule per meter
(b) Newton per meter
(c) Kelvin per meter
(d) Ampere per meter

Correct Answer: (d) Ampere per meter

Solution:

Magnetic Field Intensity (H)

The SI unit for magnetic field intensity (H) is the Ampere per meter (A/m).
This unit reflects the fact that the H-field is related to the current producing the magnetic field.

45. Farad is unit of ______ . [S.S.C. Online CHSL (T-1) 1.02.2017 (Shift-II)]

(a) Capacitance
(b) Reactance
(c) Electric charge
(d) Electric conductance

Correct Answer: (a) Capacitance

Solution:The capacitance (c) of a conductor is the result of the charge (q) given to the conductor and the change in potential (v) of the conductor due to it. That means-
C = Q/V
And its SI unit is Farad (F).

46. What is the unit of the physical quantity "Capacitance"? [S.S.C. Online CHSL (T-1) 31.01.2017 (Shift-I)]

(a) Weber
(b) Farad
(c) Tesla
(d) Ohm

Correct Answer: (b) Farad

Solution:

The unit of the physical quantity "Capacitance" is the farad (symbol: F).

47. Tesla is a unit of _____ . [S.S.C. Online CHSL (T-1) 27.01.2017 (Shift-III)]

(a) magnetic field
(b) magnetic flux
(c) magnetic induction
(d) all of the above

Correct Answer: (d) all of the above

Solution:The unit of all three quantities is the tesla, magnetic field, magnetic induction, and magnetic flux density.
10⁴ Gauss = 1 Tesla

48. What is the unit of measure of a magnetic field? [S.S.C. Online Graduation Level (T-1) 13.06.2019 (Shift-I)]

(a) Cobalt
(b) Ampere
(c) Tesla
(d) ohm

Correct Answer: (c) Tesla

Solution:The unit of all three quantities is the tesla, magnetic field, magnetic induction, and magnetic flux density.
10⁴ Gauss = 1 Tesla

49. 'Lumen is the unit of ______ . [C.P.O.S.I. 5.06.2016 (Shift-II)]

(a) illumination density
(b) the intensity of light
(c) Luminous Flux
(d) shining

Correct Answer: (c) Luminous Flux

Solution:Luminous flux (

Φ_{v}

) is a measure of the total amount of visible light emitted by a source per unit of time. It's essentially the perceived power of light, taking into account the sensitivity of the human eye to different wavelengths of light.

50. The force of attraction between an electron revolving around the nucleus and the nucleus is a________force? [S.S.C. Online C.P.O.S.L. (T-1) 5.07.2017 (Shift-II)]

(a) Mechanical
(b) Electric
(c) Magnetic
(d) Gravitational

Correct Answer: (b) Electric

Solution:An electron is an electronegative particle. A nominal force of attraction exerts on the electrons. The centrifugal force produced by the rotation of electrons balances the force of attraction of the nucleus. This does not allow the electron to fall into the nucleus. The force of attraction between the nucleus and the electron revolving around the nucleus is an electric force.