1.85 kg is suspended vertically at rest by an insulating string connected to a circuit partially immersed in a magnetic field as in the figure below. The magnetic field has magnitude B = 4.00 T and the length ℓ = 0.350 m.
Physics
19.
Mass m = 1.85 kg is suspended vertically at rest by an insulating string connected to a circuit partially immersed in a magnetic field as in the figure below. The magnetic field has magnitude B = 4.00 T and the length ℓ = 0.350 m.
A rectangular loop forms a circuit. The top of the loop of length ℓ is immersed in a magnetic field vector B, which points into the page. The bottom of the loop, from left to right, contains a resistor R and a power source ℰ. The positive terminal of the power source is on the left. Between the resistor and the power source, a mass m is suspended by an insulating string. The current I through the loop flows clockwise.
HINT
(a)
Find the current I (in A).
A
(b)
If = 115 V, find the required resistance R (in Ω).
Ω.
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