Magnetic Effects of Current

Practice Questions:

Question 11: easy

A loop in the shape of an equilateral triangle of side l is suspended between the pole pieces of a
permanent magnet such that \[\overrightarrow{B}\] is in plane of the loop. If due to a current i in the triangle a torque τ acts on it, the side l of the triangle is :

1. \[\frac{2}{\sqrt{3}}.\left( \frac{\tau}{Bi} \right)\]

2. \[\frac{1}{\sqrt{3}}.\frac{\tau}{Bi}\]

3. \[2\left( \frac{\tau}{\sqrt{3}Bi} \right)^{1/2}\]

4. \[\frac{2}{\sqrt{3}}.\left( \frac{\tau}{Bi} \right)^{1/2}\]

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Question 12: easy

When a charged particle moving with velocity \(\overrightarrow{v}\)is subjected to a magnetic field of induction \(\overrightarrow{B}\) , the force on it is non-zero. This implies the :

1. angle between \[\overrightarrow{v}\] and \[\overrightarrow{B}\] is necessary 90º

2. angle between \[\overrightarrow{v}\] and \[\overrightarrow{B}\] can have at value other than 90º

3. angle between \[\overrightarrow{v}\] and \[\overrightarrow{B}\] can have at value other than zero and 180º

4. angle between \[\overrightarrow{v}\] and \[\overrightarrow{B}\] is either zero or 180º

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Question 13: easy

An eΘ is moving in North direction & magnetic field at this place is along upward direction then
eΘ will be deviate towards :

1. East

2. West

3. North

4. South

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Question 14: easy

A ring of radius r is carrying a current I. The magnetic field B is always perpendicular to the ring as shown in Fig. The force on the ring is :

1. 2 I r B

2. I r B

3. zero

4. 2 π r IB

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Question 15: easy

A bar magnet is placed inside a non-uniform magnetic field. It may experience :

1. force and torque

2. force but not torque

3. torque but not force

4. Neither force nor torque

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Question 16: easy

The materials suitable for making electromagnets should have :

1. High retentivity and high coercivity

2. Low retentivity and low coercivity

3. High retentivity and low coercivity

4. Low retentivity and high coercivity

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Question 17: easy

The universal property among all substances is:

1. Diamagnetism

2. Paramagnetism

3. Ferromagnetism

4. non-magnetism

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Question 18: easy

A current carrying wire AC is placed in uniform transverse magnetic field then the force on wire AC :

1. 3 N

2. 4.2 N

3. 6 N

4. 4 N

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Question 19: easy

Magnetic susceptibility of the following is :

1. negative for diamagnetic

2. positive for diamagnetic and paramagnetic

3. negative for diamagnetic and zero for paramagnetic

4. zero for paramagnetic and positive for ferromagnetic

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Question 20: easy

Diamagnetic substances characterise by :

1. low and negative magnetic suceptibility

2. low and positive magnetic suceptibility

3. high and negative magnetic suceptibility

4. high and positive magnetic suceptibility

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