• Magnetic Effects of Electric Current
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Magnetic Effects of Electric Current

Description: All about magnetic effects of electric current.
Number of Questions: 15
Created by:
Tags: Magnetic field Electromagnetic conduction Representing Rational Numbers on Number Line Writing Equivalent Rational Numbers Reducing Rational Numbers to Standard Form Comparison of Rational Numbers Magnetic Field around a Current Carrying Conductor Magnetic Effects of Electric Current Magnetic Materials and their Properties Fleming`s Right Hand Rule
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The strength of a magnetic field is affected by

(a) electric current (b) number of field lines (c) direction of field lines (d) direction of current

  1. Only a and b

  2. Only c and d

  3. Only a, b and c

  4. Only b, c and d

  5. All of these

Show answer
Correct Option: A
Explanation:

Yes, it is correct. The strength of a magnetic field increases with an increase in current. Crowded field lines show stronger magnetic field.

When a piece of soft iron is placed inside a current carrying solenoid, the magnetic field of the electromagnet produced

  1. disappears in a few seconds

  2. disappears when the current is turned off

  3. never disappears

  4. disappears when the current is increased

  5. None of these

Show answer
Correct Option: B
Explanation:

Yes, it is correct. The magnet formed by producing a magnetic field inside a solenoid is called an electromagnet, but when the current is turned off, the magnetic field disappears.

The magnetic field produced inside a current carrying solenoid is

  1. straight

  2. circular

  3. parabolic

  4. elliptical

  5. there is no magnetic field

Show answer
Correct Option: A
Explanation:

Yes, it is correct. A solenoid is a coil with many circular turns of insulated copper wire wrapped closely in the shape of a cylinder. The magnetic field produced in the solenoid is similar to that in a bar magnet, i.e. straight lines.

The pattern formed by the magnetic field at the centre of the loop due to a current through a circular loop is

  1. dense concentric circles

  2. scattered concentric circles

  3. straight line

  4. random

  5. None of these

Show answer
Correct Option: C
Explanation:

This is the correct answer.

Which of the following organs in the human body produces strong magnetic field?

  1. Skin

  2. Brain

  3. Stomach

  4. Kidney

  5. Liver

Show answer
Correct Option: B
Explanation:

This is the correct answer.

If there are 20 turns in a coil, the magnitude of magnetic field produced by it will be

  1. 20 + (Magnitude of magnetic field of a single turn of coil)

  2. 20 - (Magnitude of magnetic field of a single turn of coil)

  3. 20

  4. 20 x (Magnitude of magnetic field of a single turn of coil)

  5. None of these

Show answer
Correct Option: D
Explanation:

The magnitude of magnetic field of 20 turns of the coil is 20 times the magnitude of magnetic field of a single turn of the coil.

The three-directional simple rule regarding the current, the magnetic field and the force was given by

  1. Michael Faraday

  2. Fleming

  3. Andre Marie Ampere

  4. Maxwell

  5. None of these

Show answer
Correct Option: B
Explanation:

Yes, Fleming gave a left hand rule known as Fleming's left hand rule to make us understand that if the direction of electric current is perpendicular to the magnetic field, the direction of force is also perpendicular to both of them.

Which of the following is incorrect regarding a solenoid?

  1. Solenoid has many turns

  2. The wire used in solenoid is of insulated aluminium wire

  3. Solenoid resembles the shape of a cylinder

  4. Magnetic materials can be magnetised inside it

  5. It has two ends North and South pole

Show answer
Correct Option: B
Explanation:

This is the correct answer.

Which of the following wires supplying circuits within a house pass through both the electricity metre and the main fuse to supply electricity?

  1. Live wire

  2. Neutral wire

  3. Earth wire

  4. Both 1 and 2

  5. All of the above

Show answer
Correct Option: D
Explanation:

This is the correct answer.

According to the right hand thumb rule, the thumb always points towards

  1. the direction of current flow

  2. the direction opposite to the current flow

  3. the direction of the field lines of the magnetic field

  4. the direction opposite to the field lines of the magnetic field

  5. the magnetic north pole

Show answer
Correct Option: A
Explanation:

This is the correct answer.

If the current flows from East to West, perpendicular to the magnetic field, then in which direction will the Force act on the conductor?

  1. North

  2. South

  3. Parallel to the current flow

  4. Opposite to the current flow

  5. None of these

Show answer
Correct Option: A
Explanation:

This is the correct answer.

In which of the following devices electric motor is not used as one of the components?

  1. Washing machine

  2. Fan

  3. Refrigerator

  4. Computer

  5. LEDs

Show answer
Correct Option: E
Explanation:

This is the correct answer.

Match the following:

     
1. Electric motor a. produces DC
2. Commercial motor b. produces AC
3. Electric generator c. split ring commutator
4. Electrochemical cell d. armature

  1. 1 - c, 2 - d, 3 - b, 4 - a

  2. 1 - c, 2 - d, 3 - a, 4 - b

  3. 1 - d, 2 - c, 3 - b, 4 - a

  4. 1 - a, 2 - d, 3 - b, 4 - c

  5. 1 - c, 2 - b, 3 - d, 4 - a

Show answer
Correct Option: A
Explanation:

This is the correct answer.

What will be the direction of magnetic field lines around a straight wire, if the direction of current flowing is from south to north?

  1. South to north

  2. North to south

  3. Anti-clockwise

  4. Clockwise

  5. None of these

Show answer
Correct Option: C
Explanation:

This is the correct answer.

In which of the following directions is the magnetic field lines inside the magnet?

  1. It is from north to south

  2. It is from south to north

  3. It is to and fro

  4. There are no magnetic field lines inside

  5. None of these

Show answer
Correct Option: B
Explanation:

This is the correct answer.

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