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# Simple Magnetic Circuits Online Exam Quiz

Important questions about Simple Magnetic Circuits. Simple Magnetic Circuits MCQ questions with answers. Simple Magnetic Circuits exam questions and answers for students and interviews.

### What is a permeable substance?

Options

A : a. Any good conductor

B : b. Any bad conductor

C : c. Any strong magnet

D : d. Any substance through which the magnetic lines of force can pass easily

### Materials having good retentivity are?

Options

A : a. Strong magnets

B : b. Weak magnets

C : c. Temporary magnets

D : d. Permanent magnets

### Magnetic field exists along which of the following?

Options

A : a. Moving charges

B : b. Stationary charges

C : c. Copper

D : d. Iron

### Magnetomotive force is equal to__________________

Options

A : a. current * number of turns

B : b. current / number of turns

C : c. current / number of turns per unit length

D : d. current * number of turns per unit length

Options

A : a. A/m

B : b. A-m

C : c. A

D : d. unitless

### When a bar magnet is broken into two pieces, which of the following are true?

Options

A : a. The magnet loses its magnetism

B : b. The magnet has only north pole left

C : c. The magnet has only south pole left

D : d. The magnet turns into two new bar magnets

### When an electric current flows into the page, what is the direction of the magnetic field?

Options

A : a. Clockwise

B : b. Anti-clockwise

C : c. Cannot be determined

D : d. Parallel to the current

### When an electric current flows out of the page, what is the direction of the magnetic field?

Options

A : a. Clockwise

B : b. Anti-clockwise

C : c. Cannot be determined

D : d. Parallel to the current

### Permeability of free space is also known as _________

Options

A : a. Magnetic constant

B : b. Electric constant

C : c. Electrostatic constant

D : d. Magnetostatic constant

### A substance whose permeability is less than the permeability of free space is?

Options

A : a. Diamagnetic

B : b. Paramagnetic

C : c. Ferromagnetic

D : d. Not a magnetic substance

### Which, among the following, have negative susceptibility?

Options

A : a. Diamagnetic

B : b. Paramagnetic

C : c. Ferromagnetic

D : d. Not a magnetic substance

### Which, among the following, have positive susceptibility?

Options

A : a. Diamagnetic

B : b. Paramagnetic

C : c. Ferromagnetic

D : d. Both paramagnetic and ferromagnetic

### A substance whose permeability is more than the permeability of free space is?

Options

A : a. Diamagnetic

B : b. Paramagnetic

C : c. Ferromagnetic

D : d. Both paramagnetic and ferromagnetic

Options

A : a. Henry

B : b. Henry-m

C : c. Henry/m

D : d. Henry/m²

Options

A : a. µ?=BH

B : b. µ?=B/H

C : c. µ?=H/B

D : d. µ?=BH²

### Calculate the magnetic flux density if the magnetic field strength is 2A/m.

Options

A : a. 4*pi*10¯?T

B : b. 8*pi*10¯?T

C : c. 10*pi*10¯?T

D : d. 12*pi*10¯?T

### Calculate the magnetic field strength if the magnetic flux density is 4*piT.

Options

A : a. 10¯?/16*pi²A/m

B : b. 10¯?A/m

C : c. 10?A/m

D : d. 10¯?A

### Calculate the magnetic flux density if the magnetic field strength is 3A/m.

Options

A : a. 4*pi*10¯?T

B : b. 8*pi*10¯?T

C : c. 10*pi*10¯?T

D : d. 12*pi*10¯?T

Options

A : a. H-m

B : b. H/m

C : c. H²/m

D : d. No unit

### Which of the following expressions is correct with respect to relative permeability?

Options

A : a. B = µ?µ?/H

B : b. B = µ?µ?H

C : c. B = µ?/µ?H

D : d. B = µ?µ?/H²