MAGNETIC EFFECTS OF ELECTRIC CURRENT AND MAGNETISM - Topic Wise Multiple Choice Questions (MCQ)
1 )
An element dℓ➙ = dx ↑ (where dx = 1 cm) is placed at the origin and carries a large current I = 10 Amp. What is the mag. field on the Y-axis at a distance of 0.5 meter?
Select correct option from following options
(a) 2 × 10–8 k˄ T (b) 4 × 108 k˄ T
(c) – 2 × 10–8 k˄ T (d) – 4 × 10–8 k˄ T
a
b ✔
c
d
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2 )
Two straight long conductors AOB and COD are perpendicular to each other and carry currents I1 and I2. The magnitude of the mag. field at a point "P" at a distance "a" from the point "O" in a direction perpendicular to the plane ABCD is
(a) [(μ0) / (2πa)](I1 + I2)
(b) [(μ0) / (2πa)](I1 – I2)
(c) [(μ0) / (2 πa)](I12 + I22)1/2
(d) [(μ0) / (2 πa)][(I1I2) / (I1 – I2)]
a
b
c ✔
d
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3 )
B→R graph. The mag. field B at a distance r from a long straight wire carrying a current varies with r as shown in Fig.
a
b ✔
c
d
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4 )
A current path shaped as shown in figure produces a mag. field at point ''P'', the centre at the arc BC. If the arc subtends an angle of 30° and the radius of the arc is 0.6 meter. What is the magnitude of the field at point P if the current is 3 AMP?
Select correct option from the following options
(a) 2.62 × 10–6 T (b) 2.62 × 10–7 T
(c) 3.62 × 10–7 T (d) 2.62 × 10–8 T
a
b ✔
c
d
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5 )
A length L of wire carries a steady current 1. It is bent first to form a coil of 1 turn. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same current is _________
A quarter of its first value
Unchanged
Four times of its first value ✔
A half of its first
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