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Q. No.A wire carrying a current \(I_o\) oriented along the vector \(\big(3\widehat{i}+4\widehat{j}\big)\) experiences a force per unit length of \(\big(4F\widehat{i}-3F\widehat{j}-F\widehat{k}\big)\). The magnetic field \(\overrightarrow{B}\) equals:
1. \(\frac{F}{I_o}\big(\widehat{i}+\widehat{j}\big)\)
2. \(\frac{5F}{I_o}\big(\widehat{i}+\widehat{j}+\widehat{k}\big)\)
3. \(\frac{F}{I_o}\big(\widehat{i}+\widehat{j}+\widehat{k}\big)\)
4. \(\frac{5F}{I_o}\widehat{k}\)
Subtopic: Â Lorentz Force |
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The net resistance of a voltmeter should be large to ensure that:
| 1. | it does not get overheated. |
| 2. | it does not draw excessive current. |
| 3. | it can measure large potential differences. |
| 4. | it does not appreciably change the potential difference to be measured. |
Subtopic: Â Conversion to Ammeter & Voltmeter |
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A circular loop of area \(1\) cm2, carrying a current of \(10\) A, is placed in a magnetic field of \(0.1\) T perpendicular to the plane of the loop. The torque on the loop due to the magnetic field is:
1. zero
2. \(10^{-4}\) N-m
3. \(10^{-2}\) N-m
4. \(1\) N-m
Subtopic: Â Current Carrying Loop: Force & Torque |
 53%
From NCERT
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A charged particle moves in a gravity-free space without change in velocity. Which of the following is/are possible?
| a. | \(E=0,~B=0\) |
| b. | \(E=0,~B\neq0\) |
| c. | \(E\neq0,~B=0\) |
| d. | \(E\neq0,~B\neq0\) |
Choose the correct option:
| 1. | (a), (b), (d) |
| 2. | (b), (c), (a) |
| 3. | (c), (d), (b) |
| 4. | (a), (c), (d) |
Subtopic: Â Lorentz Force |
 61%
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A proton beam is going from north to south and an electron beam is going from south to north. Neglecting the earth's magnetic field, the electron beam will be deflected:
| 1. | towards the proton beam |
| 2. | away from the proton beam |
| 3. | upwards |
| 4. | downwards |
Subtopic: Â Force between Current Carrying Wires |
 67%
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A long solenoid has a square cross-section of side \(a\). It has turn-density n (number of turns per unit axial length). A current \(i\) is passed through this solenoid. The magnetic field at the centre of the solenoid is \(B_c\). Then, \(B_c\) is proportional to:
(I) \(a\)
(II) \(1\over a\)
(III) \(n\)
(IV) \(i\)
1. I, III, IV
2. II, III, IV
3. III, IV
4. IV Only
(I) \(a\)
(II) \(1\over a\)
(III) \(n\)
(IV) \(i\)
1. I, III, IV
2. II, III, IV
3. III, IV
4. IV Only
Subtopic: Â Magnetic Field due to various cases |
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Two current carrying loops of wire are placed as shown in the figure, the inner loop (P) having a radius (r) which is much smaller than the radius (R) of the outer loop (Q). Both the loops are concentric, but the currents in one case are in the same sense while in the other, in the opposite sense.
In both cases, the torque on P due to Q is zero. If P is slightly rotated about a diameter, then, it will return to its initial position in:
In both cases, the torque on P due to Q is zero. If P is slightly rotated about a diameter, then, it will return to its initial position in:
| 1. | case (I) but not in case (II). |
| 2. | case (II) but not in case (I). |
| 3. | both cases (I) and (II). |
| 4. | neither of cases (I) and (II). |
Subtopic: Â Magnetic Moment |
From NCERT
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A particle of mass \(m\) and charge \(q\) is observed to move with a uniform velocity \(v\) in a region containing a uniform magnetic field \(B\), and a uniform gravitational field \(g\). The magnetic field \(B\) must satisfy:
1. \(B = {mg \over qv}\)
2. \(B \leq \frac{m g}{q v}\)
3. \(B \geq \frac{m g}{q v}\)
4. \(B = {qv \over mg}\)
1. \(B = {mg \over qv}\)
2. \(B \leq \frac{m g}{q v}\)
3. \(B \geq \frac{m g}{q v}\)
4. \(B = {qv \over mg}\)
Subtopic: Â Lorentz Force |
From NCERT
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A straight current-carrying wire carrying current \(I\) passes perpendicular to the plane of an imaginary rectangular loop PQRS, passing through its centre O (into the diagram). The diagonals intersect at \(60^\circ,\) and side PS is smaller than side PQ. The value of \(\int \vec{B} \cdot \overrightarrow{dl}\) evaluated from P to Q (along PQ) has the magnitude:
\(1.~ \frac{\mu_{0} I}{6}\\ 2.~ \frac{2 \mu_{0} I}{6}\\ 3.~ \frac{4\mu_{0} I}{6}\\ 4.~\frac{5\mu_{0} I}{6}\)
\(1.~ \frac{\mu_{0} I}{6}\\ 2.~ \frac{2 \mu_{0} I}{6}\\ 3.~ \frac{4\mu_{0} I}{6}\\ 4.~\frac{5\mu_{0} I}{6}\)
Subtopic: Â Ampere Circuital Law |
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Two particles of equal mass \(m\) and charge \(q\) move in a circular orbit of radius \(r\) under the influence of a magnetic field \(B\). The kinetic energy of the particles is proportional to (assume that the particles don't exert electrostatic forces on each other):
1. \(q^{2}\)
2. \(B^{2}\)
3. \(r^{2}\)
4. All of the above
1. \(q^{2}\)
2. \(B^{2}\)
3. \(r^{2}\)
4. All of the above
Subtopic: Â Lorentz Force |
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