A current balance is a device to measure magnetic forces. It is constructed from two parallel coils, each with an average radius
of 12.5 cm. The lower coil rests on a balance; it has 20 turns and carries a constant current of 4.10 A. The upper coil, suspended 0.314 cm above the lower coil, has 50 turns and a current that can be varied. The reading of the balance changes as the magnetic force on the lower coil changes. What current is needed in the upper coil to exert a force of 1.30 N on the bottom coil
1 answer:
Answer: Current I = 6.34A
Explanation: Their will be attractive force if the currents in the coils are in the same direction, repulsive if in opposite directions.
The length to be considered is the circumference of the coils, 2π r , where r is the common radius.
In this question, currents will be I 1 I = n I and I 2 I = n I , where 1 n and 2 n are the numbers of turns in the coils and I is the common current.
Please find the attached file for the solution
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Answer:
The displacement, velocity and time is 20.4 m, -4.52 m/s and 3.624 sec.
Explanation:
Given that,
Initial velocity =15.0 m/s
Height = 10 m
We need to calculate the displacement at 2 sec
Using equation of motion
Put the value into the formula
At 2 sec,
We need to calculate the time
Using equation of motion again
At ground s = 0,
Neglect the negative term because the time is not negative
We need to calculate the velocity
Using formula of velocity
Hence, The displacement, velocity and time is 20.4 m, -4.52 m/s and 3.624 sec.