Answer:
A moving electric charge creates a magnetic field at all points in the surrounding region.
An electric current in a conductor creates a magnetic field at all points in the surrounding region.
A permanent magnet creates a magnetic field at all points in the surrounding region.
Explanation:
Magnetic field can be produced by:
- moving charges (i.e. a moving electron, or a current in a conductor)
- A magnet
The strength of the magnetic field produced by a current-carrying wire is
![B=\frac{\mu_0 I}{2\pi r}](https://tex.z-dn.net/?f=B%3D%5Cfrac%7B%5Cmu_0%20I%7D%7B2%5Cpi%20r%7D)
where
I is the current
r is the distance from the wire
As we see from the formula, the magnetic field is produced at all points in the surrounding region, because B becomes zero only when r becomes infinite. The same is true for the magnetic field created by a single moving charge or by a magnet.
The following choices instead are not correct:
- A single stationary electric charge creates a magnetic field at all points in the surrounding region.
- A distribution of electric charges at rest creates a magnetic field at all points in the surrounding region.
Because they involve the presence of stationary charges, and stationary charges do not produce magnetic fields.
Answer:
the mass + the 1 constant g-force = the speed without adding air resistance
Explanation:
osmium it the most tightly packed alloy in the world so for that it will have a faster acceleration
Answer:
Obviously Lengthen...
or ![g = 4\pi ^{2} L/g](https://tex.z-dn.net/?f=g%20%3D%204%5Cpi%20%5E%7B2%7D%20L%2Fg)
Explanation:
As we can observe from the equation, time period of a simple pendulum depends upon the length directly. When the gravitational acceleration increases the time period of the pendulum decreases and vice versa. So, by increasing the length, the time period can be adjusted...
Answer:
1/3 times.
Explanation:
Let V₀ be the peak voltage .
IR ( rms ) = ( V₀ / √2 R )
R is value of resistance
IC = ( V₀ ωC / √2 )
( 1 / ωC is reactance of capacitance in ac circuit )
![\frac{I_R}{I_C} =\frac{\frac{V_0}{\sqrt{2}R } }{\frac{V_0\omega C}{\sqrt{2} } }](https://tex.z-dn.net/?f=%5Cfrac%7BI_R%7D%7BI_C%7D%20%3D%5Cfrac%7B%5Cfrac%7BV_0%7D%7B%5Csqrt%7B2%7DR%20%7D%20%7D%7B%5Cfrac%7BV_0%5Comega%20C%7D%7B%5Csqrt%7B2%7D%20%7D%20%7D)
= ![\frac{I_R}{I_C} = \frac{1}{\omega C R}](https://tex.z-dn.net/?f=%5Cfrac%7BI_R%7D%7BI_C%7D%20%3D%20%5Cfrac%7B1%7D%7B%5Comega%20C%20R%7D)
When frequency is tripled angular frequency will also be tripled
hence the ratio
becomes 1/3 times.