- 1(current)
Q. No.A helmholtz coil has a pair of loops, each with \(N\) turns and radius \(R.\) They are placed coaxially at a distance \(R\) and the same current \(I\) flows through the loops in the same direction. The magnitude of the magnetic field at the point \(P,\) midway between the centres \(A\) and \(C,\) is given by:
1. \(\dfrac{8N\mu_0I}{5^{1/2}R}\)
2. \(\dfrac{4N\mu_0I}{5^{3/2}R}\)
3. \(\dfrac{4N\mu_0I}{5^{1/2}R}\)
4. \(\dfrac{8N\mu_0I}{5^{3/2}R}\)
1. \(\dfrac{8N\mu_0I}{5^{1/2}R}\)
2. \(\dfrac{4N\mu_0I}{5^{3/2}R}\)
3. \(\dfrac{4N\mu_0I}{5^{1/2}R}\)
4. \(\dfrac{8N\mu_0I}{5^{3/2}R}\)
Subtopic: Biot-Savart Law |
From NCERT
JEE
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A thin ring of \(10~\text{cm}\) radius carries a uniformly distributed charge. The ring rotates at a constant angular speed of \(40\pi ~\text{rad}~\text{s}^{-1}\) about its axis, perpendicular to its plane. If the magnetic field at its centre is \(3.8\times 10^{-9}~\text{T},\) then the charge carried by the ring is close to:
(\(\mu_0=4\pi\times 10^{-7}~\text{N/A}^2\))
1. \(7\times 10^{-6}~\text{C}\)
2. \(4\times 10^{-5}~\text{C}\)
3. \(2\times 10^{-6}~\text{C}\)
4. \(3\times 10^{-5}~\text{C}\)
Subtopic: Biot-Savart Law |
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From NCERT
JEE
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A current loop, having two circular arcs joined by two radial lines is shown in the figure. It carries a current of \(10~\text{A}.\) The magnetic field at a point \({O}\) will be close to:
1. \(1.0\times 10^{-7}~\text{T}\)
2. \(1.5\times 10^{-7}~\text{T}\)
3. \(1.5\times 10^{-5}~\text{T}\)
4. \(1.0\times 10^{-5}~\text{T}\)
1. \(1.0\times 10^{-7}~\text{T}\)
2. \(1.5\times 10^{-7}~\text{T}\)
3. \(1.5\times 10^{-5}~\text{T}\)
4. \(1.0\times 10^{-5}~\text{T}\)
Subtopic: Biot-Savart Law |
From NCERT
JEE
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Hints
- 1(current)
Q. No.
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