A magnet is pushed into a coil connected to a sensitive ammeter. The ammeter shows a reading because
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Which change would increase the e.m.f. induced when a magnet is moved into a coil?
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A magnet is held still inside a coil. The induced e.m.f. is
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A magnet is pulled out of a coil instead of being pushed in. Compared with pushing it in, the induced e.m.f.
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An a.c. generator is connected to the external circuit by
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The magnetic field lines around a long straight wire carrying a current are
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The current in a wire is increased. The magnetic field around it
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The current in a solenoid is reversed. The magnetic field
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The magnetic field outside a current-carrying solenoid has a shape like that of
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Which change reverses the force on a current-carrying wire in a magnetic field?
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A transformer has turns on its primary coil and turns on its secondary. The primary voltage is V. Calculate the secondary voltage.
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A step-up transformer has
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A transformer will not work with a steady d.c. supply because
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A force of N acts on an area of m². Calculate the pressure.
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A force of N produces a pressure of Pa. Calculate the area it acts on.
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Convert an area of cm² into m².
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Calculate the pressure due to the water at a depth of m. Density of water kg/m³; N/kg.
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Convert km into metres.
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Which quantity is a vector?
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A pendulum makes complete oscillations in s. Calculate its period.
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