A rectangular coil with resistance R has N turns, each of length and width w as shown in the figure. The coil moves into a uniform magnetic field B with constant velocity V. What are the magnitude and direction of the total magnetic force on the coil for situations? (Use the following as necessary: N, B, w, v, and R.) (c) as it leaves the field F= x (a) as it enters the magnetic field F= --Select-- (b) as it moves within the field -Select- --Select-- X x x x x v x x xx x x x x x xx xx

The three loops of wire shown in the figure are all subject to the same uniform magnetic field B that does not vary with time. Loop 1 oscillates (through small angles, so that the loops stays in the field) back and forth as the bob in a pendulum, loop 2 rotates about a vertical axis, and loop 3 oscillates up and down (over small distances, so that the loops stays in the field) at the end of a spring. Which loop, or loops, will have an emf induced in them? B A) loops 1 and 2 B) loops 2 and 3 C) loops 3 and 1 D) loop 1 only E) loop 2 only F) loop 3 only wwwm O

Two flat, circular coils, each with a radius R and wound with N turns, are mounted along the same axis so that they are parallel a distance d apart. What is the magnetic field at the midpoint of the common axis if a current I flows in the same direction through each coil?

Consider the toroid. What direction does the magnetic field travel inside the toroid?

A negatively charged particle is moving with a constant velocity  directed to the left through a region of a uniform magnetic field   directed into the page as shown in the figure. In which direction must an electric field be applied to keep the particle moving along a straight line?

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An clectron enters a region of space containing a uniform 1.25 x 10-5 T magnetic field. Its speed is 1.5 x 10° m/s when it enters perpendicularly to the ficld. Under these conditions, the clectron undergoes circular motion. (a) Find the radius r of the electron's circular path. (b) Find the frequency f of the circular motion. 2.

A solenoid has length L, total number of turns N and current I. What happens to the magnitude of the magnetic held (B) inside the solenoid if the number of turns is doubled, with the length and current remaining the same? It becomes four times larger. It becomes one-fourth as large. It is unchanged. O It becomes one-half as large. O It becomes twice as large.

For each charge, determine the direction of the magnetic force. For the last one, determine the direction of the magnetic field. The sign of the charge is given for each part. in out |-select- v up positive negative positive positive AB B B B F B positive negative negative positive zero -select- v -select- v |-select- v

A 292 turn circular coil of diameter 54 cm is placed in the earth's magnetic field 0.42 G, such that its magnetic dipole moment makes an angle 31° with the field as shown in the picture. If the current in the circular coil is 120 A, then calculate the following: a) The magnetic dipole moment of the coil in Am? = b) The torque on the current loop measured in Nm = c) The potential energy of the current loop in joules = ol