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A current of 30 amp is flowing in a conductor as shown in the figure. The magnetic induction at point O will be

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Important Questions on Magnetic Effect of Current

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 49
Two circular coils 1 and 2 are made from the same wire but the radius of the 1st coil is twice that of the 2nd coil. What is the ratio of potential difference applied across them, so that the magnetic field at their centres is the same?
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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 50
When the number of turns in a toroidal coil is doubled, then the value of magnetic flux density will becomes
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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 51
The length of a solenoid is 0.1 m and its diameter is very small. A wire is wound over it in two layers. The number of turns in the inner layer is 50 and that on the outer layer is 40. The strength of current flowing in two layers is in the same direction and is 3 A. The magnetic induction in the middle of the solenoid will be 
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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 53
The correct curve between the magnetic induction along the axis of a along solenoid due to current flow i in it and distance x from one end is
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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 54
A long solenoid has 200 turns per cm and carries a current of 2.5 Amps. The magnetic field at its center is μ0=4π×10-7 weber/amp-m
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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 55

In a coaxial, straight cable, the central conductor and the outer conductor carry equal currents in opposite directions. The magnetic field is non-zero 

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 57
A cylindrical wire of radius R is carrying uniformly distributed current i cross–section. If a circular loop of radius r is taken as amperian loop, then the variation value of ∮B→.dl→ over this loop with radius ‘ r’ of loop will be best represented by
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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 58
A current I flows along the length of an infinitely long, straight, thin walled pipe. Then