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  1. Problems
  2. /Electricity & Magnetism
  3. /Magnetic Effects of Current

Magnetic Effects of Current

Physics
+ Upload a Problem
More in Electricity & MagnetismElectrostaticsElectric Potential and CapacitanceCurrent ElectricityMagnetic Effects of CurrentElectromagnetic InductionAlternating Current
24 problems
Type:
1.
The pointer of a galvanometer turns 80° for a full-scale current of 40 mA, and the turn is…
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Medium
2.
Explain how a loudspeaker makes sound from a changing current.
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Medium
3.
A motor coil has 80 turns, each of area 0.005 m².
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Hard
4.
A coil of 150 turns, each of area 0.003 m², carries 1.2 A in a field of 0.2 T.
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Medium
5.
Give two ways to make a simple motor turn the other way.
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Medium
6.
What is the job of the split ring (commutator) of a DC motor?
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Easy
7.
A horizontal copper rod of mass 12 g and length 0.2 m lies east to west in a horizontal field of…
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Hard
8.
A wire 0.4 m long carries 5 A in a field of 0.6 T, and it makes an angle of 60° with the field.
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Hard
9.
A wire 0.08 m long carries 6.5 A at right angles to a field of 0.6 T.
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Medium
10.
A wire 0.25 m long carries 4 A in a field of 0.35 T.
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Easy
11.
A wire 0.15 m long carries 8 A at right angles to a field of 0.45 T.
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Medium
12.
A magnetic field points from the top of the page to the bottom.
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Easy
13.
An electric bell has an electromagnet, an iron armature with a hammer, a spring, and a contact that…
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Medium
14.
A coil without a core gives a field of 2.4 mT inside.
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Easy
15.
A solenoid has 600 turns in a length of 0.25 m and carries 1.5 A.
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Medium
16.
A long straight wire carries 16 A. At what distance from it is its field 40 µT?
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Hard
17.
A single loop of wire gives a field of 0.9 µT at its centre.
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Medium
18.
A long straight wire carries 14 A. Find the field at 4 cm and at 7 cm from it.
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Medium
19.
A long vertical wire carries a current downward, toward the floor.
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Medium
20.
Oersted placed a compass needle under a wire.
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Easy
21.
A bar magnet 12 cm long is cut into three equal pieces.
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Medium
22.
A bar magnet lies on a table with its north pole to the east.
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Medium
23.
In a drawing of a bar magnet's field, 15 lines cross a gap of 1 cm next to a pole, and 3 lines…
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Easy
24.
The north pole of magnet P is brought near the north pole of magnet Q.
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Easy