Mixed Questions From Capacitance To Magnetostatics

Question 1

What is the main factor that increases the magnetic field inside a solenoid?

Answer 1

Higher permeability

Question 2

Magnetic vector potential A is defined such that:

Answer 2

∇×A = B

Question 3

The capacitance of an isolated sphere depends on:

Answer 3

Its radius

Question 4

Magnetic field lines inside a bar magnet go from:

Answer 4

South to North

Question 5

The relation between magnetic flux (Φ) and magnetic field (B) is:

Answer 5

Φ = ∫B·ds

Question 6

Which law relates the line integral of H to the current enclosed?

Answer 6

Ampere’s Law

Question 7

A material with high relative permeability is called:

Answer 7

Ferromagnetic

Question 8

Which of the following quantities is a vector?

Answer 8

Magnetic field

Question 9

Capacitance increases with:

Answer 9

Increasing dielectric constant

Question 10

The physical meaning of magnetic flux density (B) is:

Answer 10

Number of field lines per unit area

Question 11

The SI unit of magnetic field intensity (H) is:

Answer 11

A/m

Question 12

For a given capacitor, removing the dielectric will:

Answer 12

Decrease the capacitance

Question 13

If two capacitors are connected in parallel, the total capacitance is:

Answer 13

Greater than any one capacitor

Question 14

The energy density of a magnetic field is given by:

Answer 14

B² / 2μ

Question 15

Capacitance of a cylindrical capacitor is proportional to:

Answer 15

ln(b/a)

Question 16

The SI unit of magnetic flux is:

Answer 16

Weber (Wb)

Question 17

Magnetic flux density (B) is related to magnetic field intensity (H) by:

Answer 17

B = μH

Question 18

In a coaxial cable, increasing the dielectric constant:

Answer 18

Increases capacitance

Question 19

Magnetic vector potential (A) is measured in:

Answer 19

Volt-seconds per meter (V·s/m)

Question 20

Which parameter describes a material’s ability to support a magnetic field?

Answer 20

Permeability

Question 21

Magnetic field lines always form:

Answer 21

Closed loops

Question 22

A capacitor is said to be fully charged when:

Answer 22

Current is zero

Question 23

The capacitance of a spherical capacitor depends on:

Answer 23

Radii of both spheres

Question 24

Capacitance stores energy in the form of:

Answer 24

Electric field

Question 25

The magnetic field at the center of a current loop of radius r carrying current I is proportional to:

Answer 25

I/r

Question 26

The dielectric constant κ of a material is defined as:

Answer 26

Ratio of permittivity of dielectric to permittivity of free space

Question 27

The magnetic field intensity inside a long solenoid is given by:

Answer 27

μ₀ n I

Question 28

The force on a magnetic dipole in a non-uniform magnetic field is:

Answer 28

Proportional to the gradient of the magnetic field

Question 29

The capacitance of a parallel plate capacitor is directly proportional to:

Answer 29

Plate area

Question 30

Magnetostatics assumes:

Answer 30

Steady (constant) currents

Question 31

The displacement current term in Maxwell’s equations:

Answer 31

Is zero in magnetostatics

Question 32

The magnetic field outside an infinitely long straight current-carrying wire:

Answer 32

Decreases with distance

Question 33

The magnetic force between two parallel currents flowing in the same direction is:

Answer 33

Attractive

Question 34

The unit Weber (Wb) represents:

Answer 34

Magnetic flux

Question 35

The magnetic field inside a perfect magnetic shield is:

Answer 35

Zero

Question 36

The force on a current-carrying loop in a uniform magnetic field is:

Answer 36

Depends on loop orientation

Question 37

The inductance of a coil depends on:

Answer 37

Number of turns and coil geometry

Question 38

The unit of capacitance, Farad (F), is defined as:

Answer 38

Coulomb per Volt

Question 39

Magnetic field inside a hollow conductor carrying steady current is:

Answer 39

Zero

Question 40

The energy stored in a capacitor is given by:

Answer 40

1/2 C V²

Question 41

The magnetomotive force (MMF) is analogous to:

Answer 41

Voltage in electrical circuits

Question 42

The Biot–Savart law relates:

Answer 42

Magnetic field to current element

Question 43

The magnetic field inside a thick-walled solenoid is:

Answer 43

Uniform and strong

Question 44

The right-hand rule is used to determine:

Answer 44

Direction of magnetic field around a conductor