Class 10 Magnetic Effects of Electric Current Mock Test (CBSE)

Topics in Magnetic Effects of Electric Current

• Magnetic field and field lines
• Magnetic field due to a current through a straight conductor
• Right-hand thumb rule
• Magnetic field due to a current through a circular loop
• Magnetic field due to a current in a solenoid
• Force on a current-carrying conductor in a magnetic field
• Fleming's left-hand rule
• Domestic electric circuits

Magnetic Effects of Electric Current practice questions with answers

1. Q1Multiple choice·1 mark
   The direction of force on a current-carrying conductor placed in a magnetic field can be determined using:

   1. (a)Right-hand thumb rule
   2. (b)Fleming's left-hand rule
   3. (c)Fleming's right-hand rule
   4. (d)Right-hand palm rule
   Show answer and step marks

   1. Correct option: (b) Fleming's left-hand rule+1

   Answer: (b)
2. Q2Assertion and reason·1 mark
   Assertion (A): Magnetic field lines are closed continuous curves. Reason (R): Inside a bar magnet, the direction of magnetic field lines is from the North pole to the South pole.

   1. (a)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
   2. (b)Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
   3. (c)Assertion (A) is true but Reason (R) is false.
   4. (d)Assertion (A) is false but Reason (R) is true.
   Show answer and step marks

   1. Correct option: (c) Assertion (A) is true but Reason (R) is false.+1

   Answer: (c)
3. Q3Multiple choice·1 mark
   A current through a horizontal overhead power line flows from East to West. The direction of the magnetic field at a point directly below it is:

   1. (a)From North to South
   2. (b)From South to North
   3. (c)From East to West
   4. (d)Vertically downwards
   Show answer and step marks

   1. Correct option: (a) From North to South. By the right-hand thumb rule, with the thumb pointing west along the current, the curled fingers pass from north to south at a point below the wire (and from south to north above it).+1

   Answer: (a)
4. Q4Short answer·3 marks
   A straight aluminium rod is suspended horizontally by two flexible leads in a uniform vertical magnetic field directed upwards. A current is passed through the rod from West to East. (a) State the direction of the magnetic force acting on the rod. (b) Mention two ways by which the direction of this force can be reversed. (c) State the condition under which the force experienced by a current-carrying conductor placed in a magnetic field is zero.
   Show answer and step marks

   1. (a) By Fleming's left-hand rule (forefinger up along the field, middle finger east along the current), the thumb points south: the force on the rod is towards the South.+1
   2. (b) First way: reverse the direction of the current through the rod.+0.5
   3. (b) Second way: reverse the direction of the magnetic field.+0.5
   4. (c) The force experienced is zero when the direction of the current is parallel or antiparallel to the direction of the magnetic field ($0^\circ$ or $180^\circ$).+1

   Answer: (a) Towards the South. (b) Reverse the direction of the current; reverse the direction of the magnetic field. (c) When the current is parallel or antiparallel to the magnetic field.

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