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In a transformer, the coefficient of mutual inductance between the primary and the secondary coil is 0.2 H. When the current changes by 5 A s-1 in the primary, the induced emf in the secondary will be

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Important Questions on Electromagnetic Induction

MEDIUM
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 5 - Electromagnetic Induction>Objective Problems [ Level 1 ]>Q 78
Which among the given options, is increased in a step-down transformer?
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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 5 - Electromagnetic Induction>Objective Problems [ Level 1 ]>Q 79
The transformation ratio in the step-up transformer is 
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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 5 - Electromagnetic Induction>Objective Problems [ Level 1 ]>Q 80
The ratio of secondary to the primary turns in a transformer is 3:2. If the power output be P, then the input power neglecting all losses must be equal to
EASY
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 5 - Electromagnetic Induction>Objective Problems [ Level 1 ]>Q 81
We can reduce eddy currents in the core of transformer
MEDIUM
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 5 - Electromagnetic Induction>Objective Problems [ Level 1 ]>Q 82
In a transformer, number of turns in the primary are 140 and that in the secondary are 280. If current in primary is 4 A, then that in the secondary is
EASY
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 5 - Electromagnetic Induction>Objective Problems [ Level 1 ]>Q 83
Among the physical quantities that remains unchanged in a transformer is
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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 5 - Electromagnetic Induction>Objective Problems [ Level 1 ]>Q 84
In a transformer, the number of turns in primary and secondary are 500 and 2000 respectively. If current in primary is 48 A, the current in the secondary is
EASY
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 5 - Electromagnetic Induction>Objective Problems [ Level 1 ]>Q 85
A loss-free transformer having 100 turns in primary is used to transmit 10 kW of power. The input voltage is 200 V and power is transmitted at 5 kV. The currents in the primary and secondary of the transformer are