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In a silicon transistor, a change of 7.89 mA in the emitter current produce a change of 7.8 mA in the collector current. What change in the base current is necessary to produce an equivalent change in the collector current?

In a silicon transistor, a change of 7.89 mA in the emitter current produce a change of 7.6 mA in the collector current. What change in the base current is necessary to produce an equivalent change in the collector current?

The ratio of the magnetic field at the centre of a current carrying circular coil to its magnetic moment is x. If the current and radius both are doubled the new ratio will become

The ratio of the magnetic field at the centre of a current carrying circular coil to its magnetic moment is x. If the current and radius both are doubled the new ratio will become

If the peak value of a current in 50Hz AC. Cirucit is 7.07 A. What is the mean value of current over half a cycle and the value of current 1//300 s after it was zero?

Two long conductors, separated by a distance d carry current I_(1) and I_(2) in the same direction . They exert a force F on each other. Now the current in one of them is increased to two times and its direction is reversed . The distance is also increased to 3d . The new value of the force between them is