The magnetic moment of a current (i) carrying circular coil of radius (r) and number of turns (n) varies as :

(a) $1/{r}^{2}$                             (b) $1/r$

(c) r                                   (d) ${r}^{2}$

Concept Questions :-

Magnetic moment
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The current is flowing in the south direction along a power line. The direction of the magnetic field above the power line (neglecting earth's field) is :

(a) South                         (b) East

(c) North                          (d) West

Concept Questions :-

Magnetic field due to various cases
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For the magnetic field to be maximum due to a small element of current carrying conductor at a point, the angle between the element and the line joining the element to the given point must be :

(a) 0°                            (b) 90°

(c) 180°                         (d) 45°

Concept Questions :-

Biot-Savart law
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An electron and a proton enter a magnetic field perpendicularly. Both have the same kinetic energy. Which of the following is true:

1. Trajectory of electron is less curved

2. Trajectory of proton is less curved

3. Both trajectories are equally curved

4. Both move on a straight-line path

Concept Questions :-

Lorentz force
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A proton, a deuteron, and an $\alpha -$ particle having the same kinetic energy are moving in circular trajectories in a constant magnetic field. If ${r}_{p},{r}_{d}$ and ${r}_{\alpha }$ denote respectively the radii of the trajectories of these particles, then:

1. ${r}_{\alpha }={r}_{p}<{r}_{d}$

2.  ${r}_{a}>{r}_{d}>{r}_{p}$

3. ${r}_{\alpha }={r}_{d}>{r}_{p}$

4.  ${r}_{p}={r}_{d}={r}_{\alpha }$

Concept Questions :-

Lorentz force
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An electron and a proton with equal momentum enter perpendicularly into a uniform magnetic field, then :

(a) The path of proton shall be more curved than that of electron

(b) The path of proton shall be less curved than that of electron

(c) Both are equally curved

(d) Path of both will be a straight line

Concept Questions :-

Lorentz force
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One proton beam enters a magnetic field of ${10}^{-4}T$ normally, Specific charge = ${10}^{11}C/kg.$ velocity = ${10}^{7}m/s.$ What is the radius of the circle described by it:

1. $0.1m$

2. $1m$

3. $10m$

4. None of these

Concept Questions :-

Lorentz force
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In a cyclotron, the angular frequency of a charged particle is independent of :

1. Mass

2.  Speed

3. Charge

4. Magnetic field

Concept Questions :-

Cyclotron
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Maximum kinetic energy of the positive ion in the cyclotron is :

(a) $\frac{{q}^{2}B{r}_{0}}{2m}$                         (b) $\frac{q{B}^{2}{r}_{0}}{2m}$

(c) $\frac{{q}^{2}{B}^{2}{r}_{0}^{2}}{2m}$                         (d) $\frac{qB{r}_{0}}{2{m}^{2}}$

Concept Questions :-

Cyclotron
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An electron of mass m and charge q is traveling with a speed v along a circular path of radius r at right angles to a uniform of the magnetic field B. If the speed of the electron is doubled and the magnetic field is halved, then resulting path would have a radius of:

1. $\frac{r}{4}$

2. $\frac{r}{2}$

3. $2r$

4. $4r$

Concept Questions :-

Lorentz force
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