The magnetic field at the center of the 2nd loop is half the magnetic field at the center of the 1st loop.
Explanation:
The magnetic field strength at the center of a current-carrying circular loop is
where
is the vacuum permeability
I is the current
R is the radius of the loop
For the first circular loop, we have
The second loop has
(same current)
(twice the radius)
So, the magnetic field at the centre of the second loop is
So, the magnetic field at the center of the 2nd loop is half the magnetic field at the center of the 1st loop.
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Answer: 2.67 m/s
Explanation:
Given
Mass of block A is
mass of block B is
The initial velocity of block A
the initial velocity of block B is
After collision velocity of block A is
Conserving momentum
The momentum of block A after the collision is
Therefore, there is no change in sign.
Answer:
Explanation:
According to the equations of motion, , is the deceleration due to the gravitational forces. It is assumed to be a deceleration value as the gravity opposes the motion so if the initial velocity, for example, is 10m/s, the body will move until it reaches a point at which the final velocity will be zero and then it will come back. At this point, it will be assumed to be an acceleration as the motion will be in the same direction of the gravitational force.
Answer:
See Explanation below.
Explanation:
The electromagnetic spectrum is a range of frequencies spanning a very wide range. Scientists talk about frequencies from about 3 cycles per second to those at least to 10^25 cycles per second. The name for cycles per second is known at Hertz abbreviated to Hz.
Within this spectrum or range exist some of the frequencies we are talk about such as X-Rays, visible light, and wireless transmission including radio waves. However, the range goes beyond what is commonly used at this time both above and below the range.
One example of a portion of electromagnetic spectrum that is very important is the range that is visible to the human eye. This part of the spectrum, with wavelengths in the micrometer range through a few hundred nanometer wavelength range, is known as visible light. The ability to see and use the sense of eye-sight is dependent on this portion of the electromagnetic spectrum.
Another example of the electromagnetic spectrum that is well known has to do with radio waves. This part if from about 3 MHz up to about 300 GHz. Within this portion of the electromagnetic spectrum are radio and television transmissions and receptions. Also wireless phones, wireless Internet, and satellite transmission and reception are included in this portion of the electromagnetic spectrum.
Answer: work must be done on the system (Option A)
Explanation:
The second law of thermodynamics is the fundamental law of nature; it states that energy can be transferred from cold objects to hot objects only, if work is done on the system. If energy is added to the system then as a result the thermal energy would increase. Second law of thermodynamics is used to determine whether a process is spontaneous or not. Moreover,the second law of thermodynamics is also used in refrigerators.