Electromagnet | Baamboozle - Baamboozle | The Most Fun Classroom Games!

An ideal transformer has a primary voltage of 230 V and supplies a current of 2 A. The secondary voltage is 115 V. Calculate the current in the secondary coil.

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State one difference between a permanent magnet and an electromagnet.

A permanent magnet always has a magnetic field, while an electromagnet produces a magnetic field only when current flows through it.

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What happens to the magnetic field direction if the current is reversed?

The magnetic field direction reverses.

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baam

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lifesaver

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How can you increase the turning effect on a current-carrying coil?

By increasing the number of turns on the coil / increasing the current, / increasing the strength of the magnetic field.

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How can you find the direction of the magnetic field around a current-carrying wire?

By using the right-hand grip rule.

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What can be used to show the magnetic field pattern around a wire?

Iron filings or a plotting compass.

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When is the e.m.f. at its maximum value (peak or trough) — when the coil is horizontal or vertical?

When the coil is horizontal .

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A solenoid has 200 turns, carrying 3A of current. Suggest two ways to increase its magnetic field strength without changing the current.

Increase the number of turns of the solenoid and Insert a soft iron core.

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A transformer has 800 turns on the primary coil and 200 turns on the secondary coil. The input voltage is 240 V. Calculate the output voltage.

60V

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How can you increase the induced e.m.f.?

Move the conductor or magnet faster.

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What shape is the magnetic field around a straight wire carrying current?

Concentric circles around the wire.

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Which law related to this statement "The direction of the induced e.m.f. always opposes the change that causes it" ?

Lenz’s Law

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If a transformer has 200 turns on the primary coil, 50 turns on the secondary coil, and the primary voltage is 240 V, what is the secondary voltage?

60V

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