Q. No.1. \(14~\text{J}\)
2. \(8.4~\text{J}\)
3. \(4~\text{J}\)
4. \(1.4~\text{J}\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf a magnetic needle is made to vibrate in uniform field \(H\), then its time period is \(T\). If it vibrates in the field of intensity \(4H\), its time period will be:
| 1. | \(2T\) | 2. | \(\dfrac{T}{2}\) |
| 3. | \(\dfrac{2}{T}\) | 4. | \(T\) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. \(3 \times 10^{-5}\) N-m
2. \(30\) N-m
3. \(3 \times 10^{-3}\) N-m
4. \(3 \times 10^{-2}\) N-m
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA bar magnet of length \(l\) and magnetic dipole moment \(M\) is bent in the form of an arc as shown in the figure. The new magnetic dipole moment will be:
| 1. | \(\dfrac{3M}{\pi}\) | 2. | \(\dfrac{2M}{l\pi}\) |
| 3. | \(\dfrac{M}{ 2}\) | 4. | \(M\) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 1. | \(9~\text{gauss}\) | 2. | \(4~\text{gauss}\) |
| 3. | \(36~\text{gauss}\) | 4. | \(4.5~\text{gauss}\) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA long magnetic needle of length \(2L\), magnetic moment \(M\) and pole strength \(m\) units is broken into two pieces at the middle. The magnetic moment and pole strength of each piece will be:
1. \(\frac{M}{2} , \frac{m}{2}\)
2. \(M , \frac{m}{2}\)
3. \(\frac{M}{2} , m\)
4. \(M, m\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 1. | \(\frac{MB}{F}\) | 2. | \(\frac{BF}{M}\) |
| 3. | \(\frac{MF}{B}\) | 4. | \(\frac{F}{MB}\) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe magnetic moment of a bar magnet of length \(L\) and area of cross-section \(A\) is \(M\). If the magnet is cut into four identical parts each of length \(L\) and area of cross-section \(\frac{A}{4}\), then magnetic moment of each part is:
| 1. | \(\frac{M}{4}\) | 2. | \(\frac{M}{2}\) |
| 3. | \(M\) | 4. | \(4M\) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe unit of pole strength is:
1. \(\text{Am}^2\)
2. \(\text{Am}\)
3. \(\frac{\text{A}^2}{\text{m}}\)
4. \(\frac{\text{A}^2}{\text{m}^2}\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyFigure shows two small identical magnetic dipoles \(a\) and \(b\) of magnetic moments \(M\) each, placed at a separation \(2d\), with their axes perpendicular to each other. The magnetic field at the point \(P\) midway between the dipoles is:
| 1. | \(\dfrac{2 \mu_{0} M}{4 \pi d^{3}}\) | 2. | \(\dfrac{\mu_{0} M}{4 \pi d^{3}}\) |
| 3. | zero | 4. | \(\dfrac{\sqrt{5}\mu_{0} M}{4\pi d^{3}}\) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology
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