A stationary positive charge +Q is located in a magnetic field B, which is direc

Question

A stationary positive charge +Q is located in a magnetic field B, which is directed toward the right as indicated. The direction of the magnetic force on Q is: Towards the right Up There is no magnetic force Down Laser an application of Quantum and atomic theory depend upon coherent emission of light by many atoms all at the same Wavelength Frequency Temperature Speed A 100-m long wire carrying a current of 4.0 A will be accompanied by a magnetic field of what strength at a distance of 0.040 m from the wire? (magnetic permeability In empty spac T.m/A) A bar magnet is falling through a loop of wire with constant velocity. The north pole enters first. As the south pole leaves the loop of wire, the induced current (as viewed from above) will be: Along the length of the magnet Counterclockwise Zero Clockwise The current in a coil with a self inductance of 1.5mH increases from 0 to 2.0 A in a tenth of a second. What is the induced emf in the coil? 15mV 0.10V 0.30V 30mV

Explanation / Answer

1) Answer is C

2) all have the same frequency

answer is B

3)B=uo I/2*3.14*r

B=4*3.14*10^-7*4/2*3.14*0.05

B=8*10^-7/5*10^-2

B=1.6*10^-5 T

so answer is C

4) answer is counter clockwise i.e B

north pole is leaving the loop so magnetic flux will decrease

and induced B increases Flux B will point Up

5) E=-Ldi/dt

E=-1.5*10^-3* (2/0.1)

E=30*10^-3

E=30mV

so answer is d

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