IF current I flows in a coil of area A a...

IF current I flows in a coil of area A and number of turns n, the magnetic moment of the coil is

nIA

`n^2`IA

`frac(nl)(A)`

`frac((nl))sqrt(A)`

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A circular coil of N turns and diameter d carries a current I . It is unwound and rewound to make another coil of diameter 2d , current I remaining the same . Calculate the ratio of the magnetic moments of the new coil and the original coil .

A circular coil of 'N' turns and diameter 'd' carries a current 'I'. It is unwound and rewound to make another coil of diameter '2d' and current 'I' remaining the same. Calculate the ratio of the magnetic moments of the new coil and the original coil.

Two concentric coils each of radius 2pi cm are placed at right angles to each other. 3A and 4 A are the currents flowing in the coils. The magnetic induction in weber/ m^(2) at the centre of the coils will be (mu_(0)=4pixx10^(-7)H.m^(-1))

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A circular coil of N turns is made of a conducting wire of a certain length . When a current I is sent through it , the magnetic moment is p , Another coil of 2N turns is made with the same wire and the same current is sent through it . The magnetic moment becomes p'. If p : p ' = n : 1 , what is the value of n ?

A current of 1 A is flowing through a circular coil of radius 10 cm having N turns. If the magnetic field produced at the centre of the coil be 4pixx10^(-6)T , what is the value of N ?

Transformer is a device used to increase or decrease the voltage in the transmission line according to requirement, Generally the input line voltage is fed in a primary coil and the output line voltage is obtained from the terminals of another coil In an ideal transformer, the primary and secondary coils are linked is such a way that there is no loss of magnetic flux and electrical energy. In an ideal transformer, if the number of turns and input voltage across the terminals of the primary coils be N_1 and V_1 , then the output voltage at the two terminals of the secondary coil V_2=V_1.N_2/N_1 , where N_2 is the number of turns in the secondary coil . The ratio of number of turns of the primary and secondary coils of an ideal transformer is 2:1 IF the input voltage is 440 V, then output voltage is if the input power of the transformer be 44 W, then output power is In the above mentioned transformer the input and output currents are respectively.

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