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Permanent Magnets Physics - Permanent Magnets

Uttarakhand Board (UBSE) - STD 11 Science - Physics (Uttarakhand - English Medium). 54 questions in this chapter.

Question types

Permanent Magnets question types

54 questions across 4 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

54
Questions
4
Question groups
5
Question types
Sample Questions

Permanent Magnets questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark
Consider a magnetic dipole kept in the north to south direction. Let $P_1, P_2, Q_1, Q_2$ be four points at the same distance from the dipole towards north, south, east and west of the dipole respectively. The directions of the magnetic field due to the dipole are the same at:
  • ✓
    $P_1$ and $P_2$
  • B
    $Q_1$ and $Q_2$
  • C
    $P_1$ and $Q_1$
  • D
    $P_2$ and $Q_2$

Answer: A.

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Q 2M.C.Q (1 Marks)1 Mark
A circular loop carrying a current is replaced by ann equivalent magnetic dipole. A point on the axis of the loop is in:
  • ✓
    End-on position.
  • B
    Broadside-on position.
  • C
    Both.
  • D
    None.

Answer: A.

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Q 3M.C.Q (1 Marks)1 Mark
A dip circle is taken to geomagnetic equator. The needle is allowed to move in a vertical plane perpendicular to the magnetic meridian. The needle will stay:
  • A
    In horizontal direction only.
  • B
    In vertical direction only.
  • C
    In any direction except vertical and horizontal.
  • ✓
    In the direction it is released.

Answer: D.

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Q 4M.C.Q (1 Marks)1 Mark
A circular loop carrying a current is replaced by an equivalent magnetic dipole. A point on the loop is in:
  • A
    End-on position.
  • ✓
    Broadside-on position.
  • C
    Both.
  • D
    None.

Answer: B.

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Q 5M.C.Q (1 Marks)1 Mark
A horizontal circular loop carries a current that looks clockwise when viewed from above. It is replaced by an equivalent magnetic dipole consisting of a south pole $S$ and a north pole $N:$
  1. The line $SN$ should be along a diameter of the loop.
  2. The line $SN$ should be perpendicular to the plane of the loop.
  3. The south pole should be slow the loop.
  4. The north pole should be below the loop.
  • A
    $A$ and $B$
  • ✓
    $B$ and $C$
  • C
    Only $A$
  • D
    None of these

Answer: B.

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Q 81 Marks Question1 Mark
Magnetic scalar potential is defined as$\text{U}(\overrightarrow{\text{r}_2})-\text{U}(\overrightarrow{\text{r}_1})=-\int\limits^{\vec{\text{r}}_2}_{\vec{\text{r}_1}} \vec{\text{B}}.\text{d}\vec{\text{l}}.$
Apply this equation to a closed curve enclosing a long atraicht wire. The RHS of the above equation is then $-{\mu}_\text{o} \text{ i}$ by Ampere's law. We see that $\text{U}(\vec{\text{r}_2})\neq\text{U}(\vec{\text{r}_1})$ even when $\vec{\text{r}_2}=\vec{\text{r}_1}.$Can we have a magnetic acalar potential in this case?
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Q 101 Marks Question1 Mark
To measure the magnetic moment of a bar magnet, one may use:
  1. A tangent galvanometer.
  2. A deflection galvanometer if the earth's horizontal field is known.
  3. An oscillation magnetometer if the earth's horizontal field is known.
  4. Both deflection and oscillation magnetometer if the earth's horizontal field is not known.
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Q 112 Marks Questions2 Marks
Two bar magnets are placed close to each other with their opposite poles facing each other. In absence of other force the magnets are pulled towards each other and their kinetic energy increases. Does it contradict our earher knowledge that magnetic forces cannot do any work and hence cannot increase kinetic energy of a system?
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Q 122 Marks Questions2 Marks
Compare the direction of the magnetic field inside a solenoid with that of the field there if the solenoid is replaced by its equivalent combination of north pole and south pole.
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Q 132 Marks Questions2 Marks
The force on a north pole,$\overrightarrow{\text{F}}=\text{m}\overrightarrow{\text{B}},$ is parallel to the field $\overrightarrow{\text{B}}.$ Does it contradict our earlier knowledge that a magnetic field can exert forces only perpendicular to itself?
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Q 142 Marks Questions2 Marks
An iron needle is attracted to the ends of a bar magnet but not to the middle region of the magnet. Is the material making up the ends of a bar magnet different from that of the middle region?
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Q 152 Marks Questions2 Marks
Sketch the magnetic field lines for a current-carrying circular loop near its centre. Replace the loop by an equivalent magnetic dipole and sketch the magnetic field lines near the centre of the dipole. Identify the difference.
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Q 16Case study (4 Marks)4 Marks
A short magnet makes 40 oscillations per minute when used in an oscillation magnetometer at a place where the earth's horizontal magnetic field is $2\mu\text{T.}$ Another short magnet of magnetic moment $1.6A-m^2$ is placed 20cm east of the oscillating magnet. Find the new frequency of oscillation if the magnet has its north pole:
  1. Towards north.
  2. Towards south.
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Q 17Case study (4 Marks)4 Marks
The magnetic field due to the earth has a horizontal component of $26\mu\text{T}$ at a place where the dip is 60°. Find the vertical component and the magnitude of the field.
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Q 18Case study (4 Marks)4 Marks
A long bar magnet has a pole strength of 10A-m. Find the magnetic field at a point on the axis of the magnet at a distance of 5cm from the north pole of the magnet.
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Q 20Case study (4 Marks)4 Marks
Two long bar magnets are placed with their axes coinciding in such a way that the north pole of the first magnet is 2·0cm from the south pole of the second. If both the magnets have a pole strength of 10A-m, find the force exerted by one magnet on the other.
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