Chapter 12 : Magnetic Effects of Electric Current
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The phenomenon in which a changing magnetic field induces current in a conductor is called:
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Safety devices used in electric circuits include:
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A circular coil carrying current behaves like a:
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The thumb in Fleming’s Left Hand Rule indicates:
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In Fleming’s Left Hand Rule, the middle finger represents:
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In Fleming’s Left Hand Rule, the forefinger represents:
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The magnetic field lines are closest to each other where the field is:
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Which device is used to generate electricity in power stations?
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An electromagnet loses its magnetism when:
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The north pole of a compass needle points towards:
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The magnetic field around a current-carrying straight conductor depends on:
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A short circuit occurs when:
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Overloading in electric circuits can cause:
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The frequency of AC supply in India is:
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DC stands for:
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AC stands for:
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Which current changes direction periodically?
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The purpose of carbon brushes in a motor is to:
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The magnetic field lines inside a bar magnet move from:
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Which scientist discovered electromagnetic induction?
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The phenomenon of producing electric current from motion in magnetic field is called:
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The magnetic field inside a straight solenoid is similar to that of a:
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Which of the following is not a magnetic material?
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A compass needle gets deflected when brought near a current-carrying conductor due to:
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The direction of current in a conductor can be reversed by reversing:
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Which effect of electric current is used in an electric motor?
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The magnetic field at the centre of a circular loop is maximum when the loop has:
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Electric current is measured using:
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Which material is generally used for making permanent magnets?
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The force acting on a current-carrying conductor in a magnetic field depends on:
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The split ring in a DC motor acts as a:
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Magnetic field lines never:
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Which of the following is an application of electromagnets?
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The commercial unit of electrical energy is:
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The strength of magnetic field inside a solenoid increases by:
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A current-carrying conductor produces:
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The direction of induced current changes after every half rotation in:
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Which rule is used in electric generators?
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The magnetic field is strongest at the:
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In a solenoid, the magnetic field inside it is:
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The device that converts electrical energy into mechanical energy is:
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An electric fuse works on the heating effect of:
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Fleming’s Left Hand Rule is used for finding the direction of:
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The core of an electromagnet is usually made of:
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Magnetic field lines emerge from the:
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Who discovered the magnetic effect of electric current?
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The SI unit of magnetic field strength is:
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The direction of magnetic field around a conductor can be determined by:
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The magnetic field lines around a straight current-carrying conductor are:
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Which device is used to detect the presence of electric current in a circuit?
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