Plotting Non Uniform Field Lines

Q.

Which instrument is used to measure the depth of the ocean?

1. Galvanometer

2. Fluxmeter

3. Endoscope

4. Fathometer​

Q.

In a uniform magnetic field, the field lines are :

(a) curved

(b) parallel and equidistant straight lines

(c) parallel, but non-equispaced straight lines

(d) nothing can be said.

Q.

The attractive property of a magnet is maximum at?

Q.

Which of the following diagrams correctly represents the direction of field lines around a bar magnet?

1. 

2. 

3. 

4. 

Q.

State the positions of neutral points when a magnet is placed with its axis in the magnetic meridian and with its north pole pointing towards geographic south.

1. in west - east direction

2. in south - north direction

3. in north -south direction

4. in east - west direction

Q.

With reference to specifying the magnetic field, which of the following physical quantities is not an “element” of the earth’s magnetic field?

1. Magnetic dip

2. Moment of the field

3. Magnetic declination

4. Horizontal component of the field

Q.

How can you say that the strength of a magnet is maximum at its poles.

Q. Assertion :A compass needle when placed on the magnetic north pole of the earth rotates in vertical direction. Reason: The earth has only horizontal component of its magnetic field at the north pole.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q.

The magnetic field lines due to a bar magnet are correctly shown in figure:

1. 

2. 

3. 

4. 

Q. Explain why iron filings which are sprinkled on a sheet of cardboard over a bar magnet take up a definite pattern when cardboard is slightly tapped.

Q. An aeroplane, in which the distance between the tips of the wings is $50m$, is flying horizontally with a speed of $360$ km/hour, over a place where the vertical component of earth's magnetic field is $2.0\times {10}^{-4}tesla$ . The potential difference between the tips of the wings would be

1. $0.1V$
2. $1.0V$
3. $0.5V$
4. $0.2V$

Q.

Answer in brief.

What is a magnet?

Q.

what is magnetic flux?

Q. The needle of a dip circle shows an apparent dip of ${45}^o$ at a place and ${60}^o$ when the circle is rotated through ${90}^o$. The true dip is

1. $co{s}^{-1}\left(\frac{1}{\sqrt{3}}\right)$
2. $co{s}^{-1}\left(\frac{2}{\sqrt{3}}\right)$
3. $co{s}^{-1}\left(\frac{1}{2}\right)$
4. $co{s}^{-1}\left(\frac{1}{\sqrt{2}}\right)$

Q.

The positions of neutral points when a magnet is placed with its axis in the magnetic meridian and with its north pole pointing towards geographic north is:

1. in south - north direction

2. in north - south direction

3. in west - east direction

4. in east - west direction

Q. A DMM is arragned at the magnetic pole of earth in $\tan A$ position. If a bar magnet is placed at some distance from the needle, deflection is

1. $0^o$
2. ${90}^o$
3. ${45}^o$
4. ${180}^o$

Q.

The needle of a dip circle when place at a geomagnetic pole stays along

1. horizontal direction
2. east-west direction only
3. vertical direction
4. south-north direction only

Q. why do iron fillings form discrete field lines even though magnetic field lines are discrete?

Q. A device used by the sailors to find the direction in which their ship is moving is called .................

1. horse shoe
2. curve
3. magnetic field
4. magnetic needle

Q. In an uniform field the magnetic needle completes 10 oscillations in 92seconds. When a small magnet is placed in the magnetic meridian 10cm due north of needle with north pole towards south completes 15 oscillations in 69seconds. The magnetic moment of magnet ($B_H=0.3G$) is

1. $4.5A{m}^2$
2. $0.225A{m}^2$
3. $0.45A{m}^2$
4. $0.75A{m}^2$

Q. At the magnetic poles of the earth, a compass needle will be

1. Bent slightly
2. Horizontal
3. Vertical
4. Inclined at ${45}^0$ to the horizontal

Q. When a copper plate is placed below an oscillating magnetic needle, the magnetic needle soon stops but if a glass plate is placed below, it does not stop. Give reasons.

Q. When a compass needle be placed at magnetic north pole, how would it behave ? If a dip needle be placed at the place, how would it behave?

Q. A magnetic needle lying parallel to a magnetic field required W units of work to turn it through ${60}^0$. The torque required to maintain the needle in this position will be

1. $\sqrt{3}W$
2. $W$
3. $\sqrt{3}W/2$
4. $2W$

Q. A compass needle will show which one of the following directions at the earth's magnetic pole

1. Vertical
2. No particular direction
3. Horizontal
4. bent at ${45}^0$ to the vertical

Q. Assertion :If a compass needle be kept at magnetic north pole of the earth the compass needle may stay in any direction. Reason: Dip needle will stay vertical at the north pole of earth

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q.

In a uniform magnetic field, the field lines are :

1. parallel equidistant straight lines

2. Curved equidistant straight lines

3. parallel but non-equidistant straight lines

4. Curved but non-equidistant straight lines

Q. Assertion :Earth's magnetic field does not affect the working of a moving coil galvanometer. Reason: The earth's magnetic field is quite weak as compared to magnetic field produced in the moving coil galvanometer.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect