The self inductance of a coil is *L*. Keeping the length and area same, the number of turns in the coil is increased to four times. The self inductance of the coil will now be

(1) $\frac{1}{4}L$

(2) *L*

(3) 4 *L*

(4) 16 *L*

Concept Questions :-

Self-inductance

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A coil has an inductance of 2.5 *H* and a resistance of 0.5 *r*. If the coil is suddenly connected across a 6.0 *volt* battery, then the time required for the current to rise 0.63 of its final value is** **

(1) 3.5 *sec*

(2) 4.0 *sec*

(3) 4.5 *sec*

(4) 5.0 *sec*

Concept Questions :-

LR circuit

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Pure inductance of 3.0 *H* is connected as shown below. The equivalent inductance of the circuit is

(1) 1 *H*

(2) 2 *H*

(3) 3 *H*

(4) 9 *H *

Concept Questions :-

Self-inductance

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If a current of 10 *A* flows in one second through a coil, and the induced e.m.f. is 10 *V*, then the self-inductance of the coil is

(1) $\frac{2}{5}H$

(2) $\frac{4}{5}H$

(3) $\frac{5}{4}H$

(4) 1 *H*

Concept Questions :-

Self-inductance

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The adjoining figure shows two bulbs *B*_{1} and *B*_{2} resistor *R* and an inductor *L*. When the switch S is turned off

(1) Both *B*_{1} and *B*_{2} die out promptly

(2) Both *B*_{1} and *B*_{2} die out with some delay

(3) *B*_{1} dies out promptly but *B*_{2} with some delay

(4) *B*_{2} dies out promptly but *B*_{1} with some delay

Concept Questions :-

Self-inductance

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An inductance *L* and a resistance *R* are first connected to a battery. After some time the battery is disconnected but *L* and *R* remain connected in a closed circuit. Then the current reduces to 37% of its initial value in

(1) *RL* *sec*

(2) $\frac{R}{L}sec$

(3) $\frac{L}{R}sec$

(4) $\frac{1}{LR}sec$

Concept Questions :-

LR circuit

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In an *LR-*circuit, the time constant is that time in which current grows from zero to the value (where *I*_{0} is the steady-state current)

(1) 0.63* I*_{0}

(2) 0.50* I*_{0}

(3) 0.37* I*_{0}

(4) *I*_{0}

Concept Questions :-

LR circuit

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In the figure magnetic energy stored in the coil is

(1) Zero

(2) Infinite

(3) 25 *joules*

(4) None of the above

Concept Questions :-

Self-inductance

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The core of a transformer is laminated to reduce energy losses due to ** **

(1) Eddy currents

(2) Hysteresis

(3) Resistance in winding

(4) None of these

Concept Questions :-

Eddy current

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When the speed of a dc motor increases the armature current

(1) Increases

(2) Decreases

(3) Does not change

(4) Increases and decreases continuously

Concept Questions :-

Motional emf

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