A circular coil of copper wire is lying flat on a horizontal table. A bar magnet is held above the center of the coil with its south pole downward. The magnet is released from rest and falls toward the coil. As viewed from above, what is the direction of the current induced in the coil as the magnet approaches the coil? An emf is induced, but no current will flow No emf is induced, so no current is induced in the coil counterclockwise clockwise
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- A 75 turn, 10.0 cm diameter coil rotates at an angular velocity of 8.00 rad/s in a 1.40 T field, starting with the normal of the plane of the coil perpendicular to the field. Assume that the positive max emf is reached first. a)What (in V) is the peak emf? b) At what time (in s) is the peak emf first reached? c) At what time (in s) is the emf first at its most negative? and d) What is the period (in s) of the AC voltage output?A uniform magnetic field is applied paralle to the axis of a 60-turn circular coil with a radius of 6.0 cm and a resistance of 0.90 ̛. If the magnetic field increases uniformly from 0.20 T to 1.8 T in 0.20 s, what is the magnitude of the emf induced in the coil? A) 16 V B) 12 V C) 9.2 V D) 7.2 V E) 5.4 VA 100-turn square coil of side 20.0 cm rotates about a vertical axis at 1.6 x10 rev/min as indicated in the figure. The horizontal component of the Earth's magnetic field at the coil's location is equal to 2.00 x 10T. Calculate the maximum emf induced ( in units of mV) in the coil by this field. 20.0 cm 20.0 cm
- The magnetic flux through the loop increases according to the relation shown below. What is the magnitude of the induced emf in the loop when t = 3.0 sA 95 turn, 10.0 cm diameter coil rotates at an angular velocity of 8.00 rad/s in a 1.30 T field, starting with the normal of the plane of the coil perpendicular to the field. Assume that the positive max emf is reached first. a) What (in V) is the peak emf? b) At what time (in s) is the peak emf first reached? c) At what time (in s) is the emf first at its most negative? d) What is the period (in s) of the AC voltage output?A maximum emf of 1.6 x 102 V is induced in a generator coil rotating where the field changes every 0.005 s. If the coil has an area of 0.095 m² and rotates in a magnetic field of 1.1 T, how many turns are in the coil? 04 O 45 O 15 O 3 O 12 FAC P PERHEDHESION DASDOMEN
- The figure shows a uniform magnetic field that is normal to the plane of the conducting loop of resistance R. Note: the area of the non- circular portion of the circuit is negligible compared to that of the loop. B 04 Which entry in the table below correctly pairs the change in the system with the direction of the induced current through R? change in the system direction of current through R decrease the area of the loop rotate loop into the paper decrease the magnitude of B increase the area of the loop pull loop to the right from top toward bottom no induced current from bottom toward top from bottom toward top from top toward bottomIn each of two coils the rate of change of the magnetic flux in a single loop is the same. The emf induced in coil 1, which has 245 loops, is 2.51 V. The emf induced in coil 2 is 4.90 V. How many loops does coil 2 have? Number i 480 Units No unitsThe generator in the figure uses a loop that rotates with a period T. Suppose the rotation rate (i.e. frequency) is increased so that the loop is made to rotate twice as fast. How will that affect the magnitude of the induced emf? Area - A J Horseshoe magnet N The magnitude of the induced emf will increase by a factor of two. O The magnitude of the induced emf will decrease by a factor of two The magnitude of the induced emf will increase by a factor of four. O The magnitude of the induced emf will decrease by a factor of four. O The magnitude of the induced emf will not change.