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  1. Problems
  2. /Electricity & Magnetism

Electricity & Magnetism

Physics

Charges, circuits, and fields.

+ Upload a Problem
Subtopic
80 problems
Type:
1.
A kitchen circuit at 220 V has a 15 A fuse.
High School (9–10) · Current ElectricityStemPy LabStemPy Lab
Hard
2.
The live and neutral wires of a 220 V supply touch where the insulation is worn.
High School (9–10) · Current ElectricityStemPy LabStemPy Lab
Medium
3.
An electric iron has a metal body and a three-pin plug.
High School (9–10) · Current ElectricityStemPy LabStemPy Lab
Easy
4.
A 15 A circuit at 220 V has a refrigerator of 200 W, an iron of 1100 W and a geyser of 1800 W, all…
High School (9–10) · Current ElectricityStemPy LabStemPy Lab
Medium
5.
Compare an electric motor and an electric generator.
High School (9–10) · Electromagnetic InductionStemPy LabStemPy Lab
Medium
6.
How should the ends of a generator's coil be joined to the outside circuit to give an alternating…
High School (9–10) · Electromagnetic InductionStemPy LabStemPy Lab
Medium
7.
The mains supply in India has a frequency of 50 Hz.
High School (9–10) · Electromagnetic InductionStemPy LabStemPy Lab
Medium
8.
The coil of a generator turns 2100 times in one minute.
High School (9–10) · Electromagnetic InductionStemPy LabStemPy Lab
Easy
9.
When a magnet is pushed into a coil whose ends are joined together, you feel a force against the…
High School (9–10) · Electromagnetic InductionStemPy LabStemPy Lab
Medium
10.
A magnetic field points into the page. A straight conductor in it is moved to the left.
High School (9–10) · Electromagnetic InductionStemPy LabStemPy Lab
Medium
11.
A magnet pushed at 0.5 m/s into a coil of 100 turns induces 0.8 V.
High School (9–10) · Electromagnetic InductionStemPy LabStemPy Lab
Medium
12.
A coil is joined to a galvanometer. Say whether a current is induced, and which way, in each case.
High School (9–10) · Electromagnetic InductionStemPy LabStemPy Lab
Easy
13.
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
14.
Explain how a loudspeaker makes sound from a changing current.
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Medium
15.
A motor coil has 80 turns, each of area 0.005 m².
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Hard
16.
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
17.
Give two ways to make a simple motor turn the other way.
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Medium
18.
What is the job of the split ring (commutator) of a DC motor?
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Easy
19.
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
20.
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
21.
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
22.
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
23.
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
24.
A magnetic field points from the top of the page to the bottom.
High School (9–10) · Magnetic Effects of CurrentStemPy LabStemPy Lab
Easy
25.
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
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