Magnetic Effects of Electric Current - Magnetic Effects of Electric Current

Grade 10CBSE

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

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Magnetic Field and Field Lines: A magnetic field is the region around a magnet where its force can be detected. Field lines emerge from the North pole and merge at the South pole outside the magnet. Inside, they move from South to North, forming closed loops. They never intersect each other.

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I

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Magnetic Field due to a Solenoid: A solenoid is a coil of many circular turns of insulated copper wire. The magnetic field inside a long straight solenoid is uniform and represented by parallel straight lines. The field is similar to that of a bar magnet.

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B

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Electromagnetic Induction: The process by which a changing magnetic field in a conductor induces a current in another conductor. This is governed by Faraday's Law and the direction is determined by Fleming's Right-Hand Rule.

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220\text{ V}

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Safety Devices: Electric fuse and Earth wire are critical. A fuse prevents damage due to short-circuiting or overloading by melting when current exceeds a safety limit.

📐Formulae

F = B I l \sin \theta

P = V \times I

V = I \times R

E = P \times t

💡Examples

Problem 1:

B

Solution:

I

Explanation:

Remember that the direction of current used in Fleming's Left-Hand Rule is the direction of conventional current (opposite to the flow of electrons).

Problem 2:

2\text{ kW}

Solution:

I

Explanation:

5\text{ A}