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Magnetoencephalography (MEG) is a non-invasive method for studying electrical activity in the brain. It is based on the principle that an electric current creates a magnetic field, whether the current is in a wire, or in the neuron of a brain. Thus, your very thoughts at this moment are generating measurable magnetic fields outside your head! With today's technology, an MEG can detect fields as small as 1.2×10?15 T. The electric current needed to produce the magnetic field strength at a distance of 4 cm is 2.4x10^-10 A.
Assume this current to flow in the same direction in two neurons, which are parallel over 1.0 cm and separated by 0.70mm . What is the force between the two neurons?
Is it an attractive or repulsive force between these two neurons?
Point A is at position (4j -3k)cm. Point B is at position -3cm k. Point C is at position (3i -2j + 5k) cm. Point D is at position 4cm j. Charges of -4 and +5uC are at A and B respectively. What is the electric potential energy of an electron at D
A person of mass 72 stands at the center of a rotating merry-go-round platform of radius 3.40 and moment of inertia 950. The platform rotates without friction with the angular velocity 0.95. The person walks radially to the edge of the platform.
You are given 65.000 cm of copper wire with diameter 7.0000 mm. compute At what rate is thermal energy generated in the loop
A six-loop coil of current-carrying wire spanning an area of 0.0249 m2 has a magnetic dipole moment of 6.35e?3 A·m2. What current is flowing through the wire
A 5.0 kg scientific instrument, an air sampler, is tied to a weather balloon by a rope. If the upward acceleration of the balloon is 3.4 m/s2, find the tension in the rope
a parallel-plate capacitor has plates separated by 0.76 mmpart a if the electric field between the plates has a
A geologist finds that a moon rock whose mass is 8.20 kg hasan apparent mass of 6.18 kg when submerged in water. What is the density of the rock
The object is authorized to move on a horizontal frictionless surface. The object is released from rest when the spring is compressed 0.15 m. Find out the force on the object.
Consider a car driving at constant velocity. The force of friction acting on the car in Newtons is, Find the magnitude of f when v = 50 miles/h
Peter, a 100kg basketball player, lands on his feet after completing a slam dunk and then immediately jumps up again to celebrate his basket. What is the impulse exerted on Peter during this 0.50s
What are typical densities ?c, pressures Pc, and temperatures Tc in cores of stars and how does this depend on mass? And what processes dominate the pressure?
A string 1.9 m long with a mass of 2.6 g is stretched between two fixed points with a tension of 80 N. Find the frequency of the fundamental on this string
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