154755 The coefficient of self-induction of a closely wound coil of 100 turns and area of crosssection $1 \mathrm{~cm}^{2}$ is $1 \mathrm{mH}$. Find the magnetic induction at the centre of its core when a current of 2 A flows in it.

154756 The self-inductance of coil is $L$. Keeping the length and area same, the number of turns in the coil is increased to four times. The new selfinduction of the coil will be

154757 A coil having zero resistance is connected in series with a $90 \quad \Omega$ resistance and the combination is connected to $120 \mathrm{~V} .60 \mathrm{~Hz}$ line. A voltmeter reads $36 \mathrm{~V}$ across the resistance and $114 \mathrm{~V}$ across the coil. The self-inductance of the coil is

154761 The coefficient of mutual induction is $2 \mathrm{H}$ and induced e.m.f. across secondary is $2 \mathrm{kV}$, Current in the primary is reduced from $6 \mathrm{~A}$ to 3 A. The time required for the change of current is

154755 The coefficient of self-induction of a closely wound coil of 100 turns and area of crosssection $1 \mathrm{~cm}^{2}$ is $1 \mathrm{mH}$. Find the magnetic induction at the centre of its core when a current of 2 A flows in it.

154756 The self-inductance of coil is $L$. Keeping the length and area same, the number of turns in the coil is increased to four times. The new selfinduction of the coil will be

154757 A coil having zero resistance is connected in series with a $90 \quad \Omega$ resistance and the combination is connected to $120 \mathrm{~V} .60 \mathrm{~Hz}$ line. A voltmeter reads $36 \mathrm{~V}$ across the resistance and $114 \mathrm{~V}$ across the coil. The self-inductance of the coil is

154761 The coefficient of mutual induction is $2 \mathrm{H}$ and induced e.m.f. across secondary is $2 \mathrm{kV}$, Current in the primary is reduced from $6 \mathrm{~A}$ to 3 A. The time required for the change of current is

154755 The coefficient of self-induction of a closely wound coil of 100 turns and area of crosssection $1 \mathrm{~cm}^{2}$ is $1 \mathrm{mH}$. Find the magnetic induction at the centre of its core when a current of 2 A flows in it.

154756 The self-inductance of coil is $L$. Keeping the length and area same, the number of turns in the coil is increased to four times. The new selfinduction of the coil will be

154757 A coil having zero resistance is connected in series with a $90 \quad \Omega$ resistance and the combination is connected to $120 \mathrm{~V} .60 \mathrm{~Hz}$ line. A voltmeter reads $36 \mathrm{~V}$ across the resistance and $114 \mathrm{~V}$ across the coil. The self-inductance of the coil is

154761 The coefficient of mutual induction is $2 \mathrm{H}$ and induced e.m.f. across secondary is $2 \mathrm{kV}$, Current in the primary is reduced from $6 \mathrm{~A}$ to 3 A. The time required for the change of current is

154755 The coefficient of self-induction of a closely wound coil of 100 turns and area of crosssection $1 \mathrm{~cm}^{2}$ is $1 \mathrm{mH}$. Find the magnetic induction at the centre of its core when a current of 2 A flows in it.

154756 The self-inductance of coil is $L$. Keeping the length and area same, the number of turns in the coil is increased to four times. The new selfinduction of the coil will be

154757 A coil having zero resistance is connected in series with a $90 \quad \Omega$ resistance and the combination is connected to $120 \mathrm{~V} .60 \mathrm{~Hz}$ line. A voltmeter reads $36 \mathrm{~V}$ across the resistance and $114 \mathrm{~V}$ across the coil. The self-inductance of the coil is

154761 The coefficient of mutual induction is $2 \mathrm{H}$ and induced e.m.f. across secondary is $2 \mathrm{kV}$, Current in the primary is reduced from $6 \mathrm{~A}$ to 3 A. The time required for the change of current is