Boost Your Understanding of Magnetism Physics with Plainmath

The magnetic field inside a long straight solenoid carrying current
A)is zero
B)increases along its radius
C)increases as we move towards its ends
D)is the same at all points

How Many Different $f$ Orbitals Are There?

What is a compass? How is a compass used to find directions?

Magnetic field lines never intersect each other because
There will be two directions of the field at the same point.
Feild lines repel each other
Field lines follow discrete paths only
If field lines intersect they create a new magnetic field within the existing field

Two parallel wires carry currents of 20 A and 40 A in opposite directions. Another wire carrying a current antiparallel to 20 A is placed midway between the two wires. The magnetic force on it will be
Towards 20 A
Towards 40 A
Zero
Perpendicular to the plane of the current

Why is wood not attracted to a magnet?

On the Celsius scale the absolute zero of temperature is at:
A) $0^{\circ <!--\; \circ \; -->}C$
B) $-<!--\; -\; -->{32}^{\circ <!--\; \circ \; -->}C$
C) ${100}^{\circ <!--\; \circ \; -->}C$
D) $-<!--\; -\; -->{273.15}^{\circ <!--\; \circ \; -->}C$

How will separate a mixture of iron filling and sand

A bar magnet has a magnetic moment of one joule per tesla. We need an external torque of 3 Nm to hold a bar magnet that makes 30 degrees with the field. Find the work required to turn it by further 90 degrees.
A) 6.3 J
B) 8.1 J
C) 4.9 J
D) 19.5 J

A charged particle enters a uniform magnetic field with velocity vector at an angle of ${45}^{\circ <!--\; \circ \; -->}$ with the magnetic field. The pitch of the helical path followed by the particle is p. The radius of the helix will be
A) $\frac{p}{\sqrt{2}\mathrm{\pi <!--\; \pi \; -->}}$
B) $\sqrt{2}p$
C) $\frac{p}{2\mathrm{\pi <!--\; \pi \; -->}}$
D) $\frac{\sqrt{2}p}{\mathrm{\pi <!--\; \pi \; -->}}$

Magnetic field lines start from North pole and end at South pole.
True or False

The electric field of a radio wave is given by $\stackrel{\to <!--\; \to \; -->}{E}=E_0\sin <!--\; \; -->(kz-\omega t)(\stackrel{^<!--\; ^\; -->}{i}+\stackrel{^<!--\; ^\; -->}{j})$. Give a unit vector in the direction of the magnetic field at a place and time where $\sin <!--\; \; -->(kz-\omega t)$ is positive.

State a law which determines the direction of magnetic field around a current carrying wire.

When a magnet is brought close to the loop, the induced current in the loop will be in a direction such that the part of the loop facing the magnet repels the magnet. Using the above statement, choose the correct answers.
When the north pole of the magnet is brought close to the loop, the current will be anticlockwise
When the south pole of the magnet is brought close to the loop, the current will be clockwise
When the south pole of the magnet is brought close to the loop, the current will be anticlockwise
When the north pole of the magnet is brought close to the loop, the current will be clockwise

What is the electronic configuration of Fluorine?

Why do magnets tend to draw magnetic metals like iron?

What is a temporary magnet?

The magnetic field lines are __ from the straight current-carrying wire.

Aqueous solution of which of the following compounds is the best conductor of electric current?

Name any three magnet-related properties.