Home
Current Affairs January 2024

What is the correct answer?

4

Two similar polesa each 1Wba placed 1 m apart in air will experience a repulsive force of

A. 63000 N

B. 63 × 10^-3 N

C. 8 × 10^12 N

D. 796 kN

Correct Answer :

A. 63000 N


Related Questions

What is the correct answer?

4

What is the maximum number of electrons that can be accommodated in the last orbit of an atom?

A.

B.

What is the correct answer?

4

States that the ratio of the thermal conductivity is proportional to the absolute temperature for all metals.

A. Wien's displacement law

B. Hartleys law

C. Hall's law

D. Wiedemann Franz law

What is the correct answer?

4

The electrons in the last orbit of an atom are called _______ electrons.

A. free

B. valence

C. bound

D. thermionic

What is the correct answer?

4

Flux linkages equals

A. Flux times area of core

B. Flux times number of turns times area of core

C. Flux times number of turns times length of core

D. Flux times number of turns

What is the correct answer?

4

When the ferromagnetic substance is inserted in a current- carrying solenoida the magnetic field is

A. Greatly decreased

B. Greatly increased

C. Slightly decreased

D. Slightly increased

What is the correct answer?

4

When the relative permeability of a material is slightly less than 1a it is called _____ material.

A. diamagnetic

B. ferromagnetic

C. paramagnetic

D. non-magnetic

What is the correct answer?

4

Hysteresis is a phenomenon of _________ in a magnetic circuit.

A. setting up constant flux

B. lagging of H behind B

C. lagging B behind H

D. leading B ahead H

What is the correct answer?

4

Electromotive force in a circuit

A. causes free electrons to flow

B. increases the circuit resistance

C. maintains circuit resistance

D. is needed to make the circuit complete

What is the correct answer?

4

The magnetic field of a magnetized iron bar when strongly heated

A. Becomes weaker

B. Becomes stronger

C. Reverses in direction

D. is unchanged

What is the correct answer?

4

Paramagnetic substance has a relative permeability of

A. Slightly less than one

B. Equal to one

C. Slightly equal to one

D. Very much greater than one

What is the correct answer?

4

If the distance between two magnetic poles decreases by 2 timesa the force between them

A. decreases two times

B. increases four times

C. increases two times

D. decreases four times

What is the correct answer?

4

If the number of valence electrons of an atom is less than 4a the substance is called

A. a conductor

B. a semiconductor

C. an insulator

D. a superconductor

What is the correct answer?

4

A negative ion results when an atom gains an additional

A. Electron

B. Proton

C. Neutron

D. Atom

What is the correct answer?

4

A test charge means a charge of

A. -1 C

B. 1 electron

C. +1 C

D. -20 C

What is the correct answer?

4

Which of the following is a paramagnetic material?

A. Carbon

B. Copper

C. Bismuth

D. Oxygen

What is the correct answer?

4

The process by which an emf and hence current is generated or induced in a conductor when there is a change in the magnetic flux linking the conductor is called

A. Electromagnetic induction

B. Mutual induction

C. Faraday's law

D. Electromagnetic interference

What is the correct answer?

4

The force which set ups or tends to set up magnetic flux in a magnetic circuit

A. Dynamic force

B. Electromotive force

C. Potential difference

D. Magnetomotive force

What is the correct answer?

4

The space outside the magnet where its pole have a force of attraction or repulsion on a magnetic pole is called

A. Magnetic field

B. Electric field

C. Electromagnetic field

D. Free Space Field

What is the correct answer?

4

Refers to the magnetic lines

A. Flux

B. Hysteresis

C. Current

D. Magnetomotive force

What is the correct answer?

4

The resistance of a material is ____________ its area of cross-section.

A. directly proportional

B. independent of

C. inversely proportional to

D. equal to

What is the correct answer?

4

Permeance of a magnetic circuit is _________ the cross-sectional area of the circuit.

A. directly proportional to

B. inversely proportional to

C. dependent of

D. independent of

What is the correct answer?

4

The greater percentage of materials is _________.

A. diamagnetic

B. paramagnetic

C. ferromagnetic

D. non-magnetic

What is the correct answer?

4

Who demonstrated that there are magnetic effects around every current-carrying conductor and that current-carrying conductors can attract and repel each other just like magnets?

A. Luigi Galvani

B. Hans Christian Oersted

C. Charles Coulomb

D. Andre Ampere

What is the correct answer?

4

The force between two magnetic poles is _____ their poles strength.

A. equal to

B. directly proportional to

C. inversely proportional to

D. directly proportional to the square root of

What is the correct answer?

4

The straight line passing through the two poles of magnet is called

A. Real axis

B. Cartesian axis

C. Magnetic axis

D. Imaginary axis

What is the correct answer?

4

Defined as the number of lines per unit area through any substance in a plane at right angles to the lines of force

A. Flux

B. Flux lines

C. Flux density

D. Flux intensity

What is the correct answer?

4

A magnetic flux of 2.5 x10^4 Wb through an area of 5 x10^4 square meters results in

A. 5 Wb

B. 0.5 Tesia of flux density

C. 5x 10^-5 Wb of flux

D. 5000 Tesia of flux density

What is the correct answer?

4

What is the SI unit of conductance?

A. Siemens

B. Mhos

C. Ohms

D. 1/Ohms

What is the correct answer?

4

The simplest type of atom to exist is the ______ atom.

A. Helium

B. Hydrogen

C. Boron

D. Oxygen

What is the correct answer?

4

The conduction of electricity across the surface of a dielectric is called

A. creepage

B. skin effect

C. surface effect

D. crosstalk