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The magnetic field at the centre of a current carrying circular loop is B. If the radius of the loop is doubled, keeping the current same, the magnetic field at the centre of the loop would be

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Important Questions on Moving Charges and Magnetism

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CUET (UG)
IMPORTANT
Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 67
An infinitely long straight conductor is bent into the shape as shown below. It carries a current of I ampere and the radius of the circular loop is R metre. Then, the magnitude of magnetic induction at the centre of the circular loop is -

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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 68
A wire of certain length carries a steady current. It is bent first to form a circular coil of one turn. The same wire is next bent to form a circular coil of three turns. The magnetic flux density at the centre of coil caused by the current of same strength shall be-
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CUET (UG)
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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 69
A Helmholtz coil has a pair of loops, each with N turns and radius R . They are placed coaxially at distance R and the same current I flows through the loops in the same direction. The magnitude of the magnetic field at P, midway between the centres A and C, is given by [Refer to figure given below]:
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CUET (UG)
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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 70
Magnetic field at the centre of a circular coil of radius R due to i flowing through it is B. The magnetic field at a point along the axis at distance R from the centre is
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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 71
An electron moves in a circular orbit with a uniform speed v. It produces a magnetic field B at the centre of the circle. The radius of the circle is proportional to
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CUET (UG)
IMPORTANT
Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 72
A thin ring of radius R meter has charge q coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of f revolutions per second. The value of magnetic induction in Wb m-2 at the centre of the ring is
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CUET (UG)
IMPORTANT
Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 73
An electron moves in a circular orbit with a uniform speed v. It produces a magnetic field B at the Centre of the circle. The radius of the circle is proportional to 
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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 74
The magnitude of the magnetic field at the centre of a tightly wound 150 turns coil of radius 12 cm carrying a current of 2 A is: (1 G=10-4 T, μ0=4π×10-7 T m A-1)