Effects of electric current
Maharashtra Board · Class 10 · Science
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Quick Quiz: Effects of electric current
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What is the SI unit of electrical power?
What happens to a magnetic needle placed near a current-carrying wire?
1 kWh is equal to how many joules?
The right-hand thumb rule is used to find:
Sample Questions
Which of the following are examples of heating effect of electric current?
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Electric bulb, Electric heater, Electric cooker
Electric bulb, heater, and cooker all work on the heating effect of current where electrical energy is converted to heat energy. Electric motor works on magnetic effect, and galvanometer detects current.
According to Joule's law of heating, heat produced is directly proportional to:
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Square of current (I²), Resistance (R), Time (t)
Joule's law states H = I²Rt, so heat is directly proportional to I², R, and t. It is not proportional to the square root of current.
In a solenoid, the magnetic field inside is:
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Uniform
Inside a solenoid, the magnetic field lines are parallel to each other, making the magnetic field uniform everywhere inside the solenoid.
Fleming's left-hand rule is used to find:
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Direction of force on conductor
Fleming's left-hand rule finds the direction of force on a current-carrying conductor in a magnetic field. Middle finger = current, index finger = magnetic field, thumb = force direction.
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