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Physics

Magnetic Effects of Electric Current

294+ practice questions available

Sample Practice Questions

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1
Easy

Read the following and answer the questions: A student performs an experiment to plot the magnetic field lines of a bar magnet using a small compass. He moves the compass from the North pole towards the South pole and marks the positions of the needle. He finds that the field lines form specific patterns and have certain properties. At which part of the magnet is the magnetic field the strongest?

AAt the center of the magnet
BAt the poles
CEqually strong everywhere
DOutside the field lines
2
Easy

Oersted's experiment demonstrated that:

AMagnets produce electric current
BElectric current produces a magnetic field
CLight is an electromagnetic wave
DMagnetic field lines are closed loops
3
Medium

In the diagram, when the coil has completed half a rotation, the split ring halves C1 and C2 swap contact with brushes B1 and B2. This ensures that:

AThe current in the external circuit reverses
BThe current in the coil reverses, maintaining the same direction of rotation
CThe motor speed increases
DThe magnetic field reverses
4
Medium

In an AC generator, the number of slip rings used is:

AOne
BTwo
CThree
DFour
5
Hard

If the speed of rotation of a generator is doubled, the peak EMF produced will:

ARemain the same
BBe doubled
CBe halved
DBe quadrupled

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